gdb/tui: Remove casts of NULL during assignment.

In the following code:

    struct symbol *wsym = (struct symbol *) NULL;

the cast of NULL is redundant, it adds noise, and is just one more thing
to change if the type of wsym ever changes.  There are a relatively
small number of places in gdb where the above code pattern is used.
Usually the cast is removed like this:

    struct symbol *wsym = NULL;

This commit updates all the places within the gdb/tui directory where we
cast NULL during assignment, removing the cast.

gdb/ChangeLog:

	* tui/tui-data.c (win_with_focus): Remove cast of NULL pointer.
	(tui_next_win): Likewise.
	(tui_prev_win): Likewise.
	(tui_partial_win_by_name): Likewise.
	(tui_init_generic_part): Likewise.
	(init_content_element): Likewise.
	(tui_del_window): Likewise.
	(tui_free_window): Likewise.
	(tui_del_data_windows): Likewise.
	(tui_free_data_content): Likewise.
	* tui/tui-layout.c (make_source_or_disasm_window): Likewise.
	* tui/tui-regs.c (tui_show_register_group): Likewise.
	* tui/tui-win.c (tui_resize_all): Likewise.
	(tui_set_focus): Likewise.
	(tui_set_win_height): Likewise.
	(make_invisible_and_set_new_height): Likewise.
	* tui/tui-windata.c (tui_delete_data_content_windows): Likewise.
	* tui/tui-wingeneral.c (make_visible): Likewise.

7 files changed, 45 insertions, 24 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index fdf2cd1..370980d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,26 @@
 2015-09-04  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* tui/tui-data.c (win_with_focus): Remove cast of NULL pointer.
+	(tui_next_win): Likewise.
+	(tui_prev_win): Likewise.
+	(tui_partial_win_by_name): Likewise.
+	(tui_init_generic_part): Likewise.
+	(init_content_element): Likewise.
+	(tui_del_window): Likewise.
+	(tui_free_window): Likewise.
+	(tui_del_data_windows): Likewise.
+	(tui_free_data_content): Likewise.
+	* tui/tui-layout.c (make_source_or_disasm_window): Likewise.
+	* tui/tui-regs.c (tui_show_register_group): Likewise.
+	* tui/tui-win.c (tui_resize_all): Likewise.
+	(tui_set_focus): Likewise.
+	(tui_set_win_height): Likewise.
+	(make_invisible_and_set_new_height): Likewise.
+	* tui/tui-windata.c (tui_delete_data_content_windows): Likewise.
+	* tui/tui-wingeneral.c (make_visible): Likewise.
+
+2015-09-04  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* cli/cli-decode.c (find_cmd): Remove cast of NULL pointer.
 
 2015-09-04  Andrew Burgess  <andrew.burgess@embecosm.com>
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index b584251..2fcd547 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -41,7 +41,7 @@ static struct tui_gen_win_info exec_info[2];
 static struct tui_win_info *src_win_list[2];
 static struct tui_list source_windows = {src_win_list, 0};
 static int default_tab_len = DEFAULT_TAB_LEN;
-static struct tui_win_info *win_with_focus = (struct tui_win_info *) NULL;
+static struct tui_win_info *win_with_focus = NULL;
 static struct tui_layout_def layout_def = {
   SRC_WIN,			/* DISPLAY_MODE */
   FALSE};			/* SPLIT */
@@ -315,7 +315,7 @@ struct tui_win_info *
 tui_next_win (struct tui_win_info *cur_win)
 {
   int type = cur_win->generic.type;
-  struct tui_win_info *next_win = (struct tui_win_info *) NULL;
+  struct tui_win_info *next_win = NULL;
 
   if (cur_win->generic.type == CMD_WIN)
     type = SRC_WIN;
@@ -345,7 +345,7 @@ struct tui_win_info *
 tui_prev_win (struct tui_win_info *cur_win)
 {
   int type = cur_win->generic.type;
-  struct tui_win_info *prev = (struct tui_win_info *) NULL;
+  struct tui_win_info *prev = NULL;
 
   if (cur_win->generic.type == SRC_WIN)
     type = CMD_WIN;
@@ -373,7 +373,7 @@ tui_prev_win (struct tui_win_info *cur_win)
 struct tui_win_info *
 tui_partial_win_by_name (char *name)
 {
-  struct tui_win_info *win_info = (struct tui_win_info *) NULL;
+  struct tui_win_info *win_info = NULL;
 
   if (name != (char *) NULL)
     {
@@ -458,7 +458,7 @@ tui_init_generic_part (struct tui_gen_win_info *win)
     win->viewport_height =
     win->content_size =
     win->last_visible_line = 0;
-  win->handle = (WINDOW *) NULL;
+  win->handle = NULL;
   win->content = NULL;
   win->content_in_use =
     win->is_visible = FALSE;
@@ -477,7 +477,7 @@ init_content_element (struct tui_win_element *element,
     {
     case SRC_WIN:
     case DISASSEM_WIN:
-      element->which_element.source.line = (char *) NULL;
+      element->which_element.source.line = NULL;
       element->which_element.source.line_or_addr.loa = LOA_LINE;
       element->which_element.source.line_or_addr.u.line_no = 0;
       element->which_element.source.is_exec_point = FALSE;
@@ -491,15 +491,15 @@ init_content_element (struct tui_win_element *element,
       element->which_element.data_window.content_size = 1;
       break;
     case CMD_WIN:
-      element->which_element.command.line = (char *) NULL;
+      element->which_element.command.line = NULL;
       break;
     case DATA_ITEM_WIN:
-      element->which_element.data.name = (char *) NULL;
+      element->which_element.data.name = NULL;
       element->which_element.data.type = TUI_REGISTER;
       element->which_element.data.item_no = UNDEFINED_ITEM;
       element->which_element.data.value = NULL;
       element->which_element.data.highlight = FALSE;
-      element->which_element.data.content = (char*) NULL;
+      element->which_element.data.content = NULL;
       break;
     case LOCATOR_WIN:
       element->which_element.locator.full_name[0] =
@@ -665,7 +665,7 @@ tui_del_window (struct tui_win_info *win_info)
       if (generic_win != (struct tui_gen_win_info *) NULL)
 	{
 	  tui_delete_win (generic_win->handle);
-	  generic_win->handle = (WINDOW *) NULL;
+	  generic_win->handle = NULL;
 	  generic_win->is_visible = FALSE;
 	}
       if (win_info->detail.source_info.fullname)
@@ -677,7 +677,7 @@ tui_del_window (struct tui_win_info *win_info)
       if (generic_win != (struct tui_gen_win_info *) NULL)
 	{
 	  tui_delete_win (generic_win->handle);
-	  generic_win->handle = (WINDOW *) NULL;
+	  generic_win->handle = NULL;
 	  generic_win->is_visible = FALSE;
 	}
       break;
@@ -696,7 +696,7 @@ tui_del_window (struct tui_win_info *win_info)
   if (win_info->generic.handle != (WINDOW *) NULL)
     {
       tui_delete_win (win_info->generic.handle);
-      win_info->generic.handle = (WINDOW *) NULL;
+      win_info->generic.handle = NULL;
       win_info->generic.is_visible = FALSE;
     }
 }
@@ -720,7 +720,7 @@ tui_free_window (struct tui_win_info *win_info)
       if (generic_win != (struct tui_gen_win_info *) NULL)
 	{
 	  tui_delete_win (generic_win->handle);
-	  generic_win->handle = (WINDOW *) NULL;
+	  generic_win->handle = NULL;
 	  tui_free_win_content (generic_win);
 	}
       break;
@@ -749,7 +749,7 @@ tui_free_window (struct tui_win_info *win_info)
   if (win_info->generic.handle != (WINDOW *) NULL)
     {
       tui_delete_win (win_info->generic.handle);
-      win_info->generic.handle = (WINDOW *) NULL;
+      win_info->generic.handle = NULL;
       tui_free_win_content (&win_info->generic);
     }
   if (win_info->generic.title)
@@ -807,7 +807,7 @@ tui_del_data_windows (tui_win_content content,
       if (generic_win != (struct tui_gen_win_info *) NULL)
 	{
 	  tui_delete_win (generic_win->handle);
-	  generic_win->handle = (WINDOW *) NULL;
+	  generic_win->handle = NULL;
 	  generic_win->is_visible = FALSE;
 	}
     }
@@ -831,7 +831,7 @@ tui_free_data_content (tui_win_content content,
       if (generic_win != (struct tui_gen_win_info *) NULL)
 	{
 	  tui_delete_win (generic_win->handle);
-	  generic_win->handle = (WINDOW *) NULL;
+	  generic_win->handle = NULL;
 	  tui_free_win_content (generic_win);
 	}
     }
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 0255c39..2528296 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -863,7 +863,7 @@ make_source_or_disasm_window (struct tui_win_info **win_info_ptr,
 			      enum tui_win_type type,
 			      int height, int origin_y)
 {
-  struct tui_gen_win_info *execution_info = (struct tui_gen_win_info *) NULL;
+  struct tui_gen_win_info *execution_info = NULL;
 
   /* Create the exeuction info window.  */
   if (type == SRC_WIN)
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index a61fadb..fde1707 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -244,7 +244,7 @@ tui_show_register_group (struct reggroup *group,
     {
       if (!refresh_values_only || allocated_here)
 	{
-	  TUI_DATA_WIN->generic.content = (void*) NULL;
+	  TUI_DATA_WIN->generic.content = NULL;
 	  TUI_DATA_WIN->generic.content_size = 0;
 	  tui_add_content_elements (&TUI_DATA_WIN->generic, nr_regs);
 	  display_info->regs_content
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index 6768d35..d841a61 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -900,7 +900,7 @@ tui_resize_all (void)
 	      && !tui_win_list[win_type]->generic.is_visible)
 	    {
 	      tui_free_window (tui_win_list[win_type]);
-	      tui_win_list[win_type] = (struct tui_win_info *) NULL;
+	      tui_win_list[win_type] = NULL;
 	    }
 	}
       /* Turn keypad back on, unless focus is in the command
@@ -1048,7 +1048,7 @@ tui_set_focus (char *arg, int from_tty)
     {
       char *buf_ptr = (char *) xstrdup (arg);
       int i;
-      struct tui_win_info *win_info = (struct tui_win_info *) NULL;
+      struct tui_win_info *win_info = NULL;
 
       for (i = 0; (i < strlen (buf_ptr)); i++)
 	buf_ptr[i] = tolower (arg[i]);
@@ -1170,7 +1170,7 @@ tui_set_win_height (char *arg, int from_tty)
     {
       char *buf = xstrdup (arg);
       char *buf_ptr = buf;
-      char *wname = (char *) NULL;
+      char *wname = NULL;
       int new_height, i;
       struct tui_win_info *win_info;
       struct cleanup *old_chain;
@@ -1457,7 +1457,7 @@ make_invisible_and_set_new_height (struct tui_win_info *win_info,
 	    &((struct tui_win_element *)
 	      win_info->generic.content[i])->which_element.data_window;
 	  tui_delete_win (gen_win_info->handle);
-	  gen_win_info->handle = (WINDOW *) NULL;
+	  gen_win_info->handle = NULL;
 	}
       break;
     default:
diff --git a/gdb/tui/tui-windata.c b/gdb/tui/tui-windata.c
index 5271ee8..08be4d5 100644
--- a/gdb/tui/tui-windata.c
+++ b/gdb/tui/tui-windata.c
@@ -94,7 +94,7 @@ tui_delete_data_content_windows (void)
       data_item_win_ptr = &((tui_win_content)
 			    TUI_DATA_WIN->generic.content)[i]->which_element.data_window;
       tui_delete_win (data_item_win_ptr->handle);
-      data_item_win_ptr->handle = (WINDOW *) NULL;
+      data_item_win_ptr->handle = NULL;
       data_item_win_ptr->is_visible = FALSE;
     }
 }
diff --git a/gdb/tui/tui-wingeneral.c b/gdb/tui/tui-wingeneral.c
index b95da49..b6d3d0f 100644
--- a/gdb/tui/tui-wingeneral.c
+++ b/gdb/tui/tui-wingeneral.c
@@ -194,7 +194,7 @@ make_visible (struct tui_gen_win_info *win_info, int visible)
     {
       win_info->is_visible = FALSE;
       tui_delete_win (win_info->handle);
-      win_info->handle = (WINDOW *) NULL;
+      win_info->handle = NULL;
     }
 
   return;