Remove more unnecessary casts of NULL

I found a few more spots that unnecessarily cast NULL to a pointer
type.  My earlier search included a "*" in the cast, but these use a
typedef to a pointer type instead.  This patch removes these casts.

gdb/ChangeLog
2019-06-16  Tom Tromey  <tom@tromey.com>

	* tui/tui-data.c (tui_clear_win_detail, init_win_info)
	(tui_free_window, free_content, free_content_elements): Remove
	unnecessary cast.
	* tui/tui-windata.c (tui_display_all_data): Remove unnecessary
	cast.
	* tui/tui-regs.c (tui_show_register_group)
	(tui_display_registers_from, tui_display_reg_element_at_line):
	Remove unnecessary cast.

4 files changed, 24 insertions, 19 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index cf7a1ab..f16d847 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2019-06-16  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-data.c (tui_clear_win_detail, init_win_info)
+	(tui_free_window, free_content, free_content_elements): Remove
+	unnecessary cast.
+	* tui/tui-windata.c (tui_display_all_data): Remove unnecessary
+	cast.
+	* tui/tui-regs.c (tui_show_register_group)
+	(tui_display_registers_from, tui_display_reg_element_at_line):
+	Remove unnecessary cast.
+
 2019-06-16  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* linux-nat.c (normal_mask): Delete.
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 35eae4f..2df9cbc 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -198,11 +198,9 @@ tui_clear_win_detail (struct tui_win_info *win_info)
 	  wmove (win_info->generic.handle, 0, 0);
 	  break;
 	case DATA_WIN:
-	  win_info->detail.data_display_info.data_content =
-	    (tui_win_content) NULL;
+	  win_info->detail.data_display_info.data_content = NULL;
 	  win_info->detail.data_display_info.data_content_count = 0;
-	  win_info->detail.data_display_info.regs_content =
-	    (tui_win_content) NULL;
+	  win_info->detail.data_display_info.regs_content = NULL;
 	  win_info->detail.data_display_info.regs_content_count = 0;
 	  win_info->detail.data_display_info.regs_column_count = 1;
 	  win_info->detail.data_display_info.display_regs = FALSE;
@@ -516,9 +514,9 @@ init_win_info (struct tui_win_info *win_info)
       win_info->detail.source_info.fullname = NULL;
       break;
     case DATA_WIN:
-      win_info->detail.data_display_info.data_content = (tui_win_content) NULL;
+      win_info->detail.data_display_info.data_content = NULL;
       win_info->detail.data_display_info.data_content_count = 0;
-      win_info->detail.data_display_info.regs_content = (tui_win_content) NULL;
+      win_info->detail.data_display_info.regs_content = NULL;
       win_info->detail.data_display_info.regs_content_count = 0;
       win_info->detail.data_display_info.regs_column_count = 1;
       win_info->detail.data_display_info.display_regs = FALSE;
@@ -686,13 +684,11 @@ tui_free_window (struct tui_win_info *win_info)
 	{
 	  tui_free_data_content (win_info->detail.data_display_info.regs_content,
 				 win_info->detail.data_display_info.regs_content_count);
-	  win_info->detail.data_display_info.regs_content =
-	    (tui_win_content) NULL;
+	  win_info->detail.data_display_info.regs_content = NULL;
 	  win_info->detail.data_display_info.regs_content_count = 0;
 	  tui_free_data_content (win_info->detail.data_display_info.data_content,
 				 win_info->detail.data_display_info.data_content_count);
-	  win_info->detail.data_display_info.data_content =
-	    (tui_win_content) NULL;
+	  win_info->detail.data_display_info.data_content = NULL;
 	  win_info->detail.data_display_info.data_content_count = 0;
 	  win_info->detail.data_display_info.regs_column_count = 1;
 	  win_info->detail.data_display_info.display_regs = FALSE;
@@ -808,7 +804,7 @@ free_content (tui_win_content content,
 	      int content_size, 
 	      enum tui_win_type win_type)
 {
-  if (content != (tui_win_content) NULL)
+  if (content != NULL)
     {
       free_content_elements (content, content_size, win_type);
       xfree (content);
@@ -823,7 +819,7 @@ free_content_elements (tui_win_content content,
 		       int content_size, 
 		       enum tui_win_type type)
 {
-  if (content != (tui_win_content) NULL)
+  if (content != NULL)
     {
       int i;
 
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index dcfc433..b345611 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -237,7 +237,7 @@ tui_show_register_group (struct reggroup *group,
       refresh_values_only = FALSE;
     }
 
-  if (display_info->regs_content != (tui_win_content) NULL)
+  if (display_info->regs_content != NULL)
     {
       if (!refresh_values_only || allocated_here)
 	{
@@ -299,7 +299,7 @@ tui_display_registers_from (int start_element_no)
 {
   struct tui_data_info *display_info = &TUI_DATA_WIN->detail.data_display_info;
 
-  if (display_info->regs_content != (tui_win_content) NULL 
+  if (display_info->regs_content != NULL
       && display_info->regs_content_count > 0)
     {
       int i = start_element_no;
@@ -398,8 +398,7 @@ static void
 tui_display_reg_element_at_line (int start_element_no,
 				 int start_line_no)
 {
-  if (TUI_DATA_WIN->detail.data_display_info.regs_content
-      != (tui_win_content) NULL
+  if (TUI_DATA_WIN->detail.data_display_info.regs_content != NULL
       && TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
     {
       int element_no = start_element_no;
diff --git a/gdb/tui/tui-windata.c b/gdb/tui/tui-windata.c
index 6f150c9..8616b6c 100644
--- a/gdb/tui/tui-windata.c
+++ b/gdb/tui/tui-windata.c
@@ -55,7 +55,7 @@ tui_first_data_item_displayed (void)
 
       data_item_win
 	= &TUI_DATA_WIN->generic.content[i]->which_element.data_window;
-      if (data_item_win->handle != NULL 
+      if (data_item_win->handle != NULL
 	  && data_item_win->is_visible)
 	element_no = i;
     }
@@ -138,8 +138,7 @@ tui_display_all_data (void)
       tui_display_registers_from (0);
 
       /* Then display the other data.  */
-      if (TUI_DATA_WIN->detail.data_display_info.data_content !=
-	  (tui_win_content) NULL 
+      if (TUI_DATA_WIN->detail.data_display_info.data_content != NULL
 	  && TUI_DATA_WIN->detail.data_display_info.data_content_count > 0)
 	{
 	}