Remove unnecessary casts of NULL

I noticed some unnecessary casts of NULL.  This removes all the
unnecessary ones, leaving only ones where we must ensure that NULL has
pointer type for passing through varargs.

I removed a couple of useless casts of 0 that I noticed while writing
this.

Tested by rebuilding.

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

	* valops.c (value_cast, value_slice): Remove unnecessary cast.
	* breakpoint.c (stopin_command, stopat_command)
	(until_break_command, decode_location_default): Remove unnecessary
	cast.
	* utils.c (subset_compare): Remove unnecessary cast.
	* ada-lang.c (ada_update_initial_language): Remove unnecessary
	cast.
	* linespec.c (decode_line_with_last_displayed): Remove unnecessary
	cast.
	* infcmd.c (path_command): Remove unnecessary cast.
	* coffread.c (decode_type): Remove unnecessary cast.
	* xcoffread.c (read_xcoff_symtab): Remove unnecessary cast.
	* mipsread.c (mipscoff_symfile_read): Remove unnecessary cast.
	* tui/tui-stack.c (tui_show_locator_content)
	(tui_show_frame_info): Remove unnecessary cast.
	* tui/tui-win.c (tui_scroll_forward_command)
	(tui_scroll_backward_command, tui_set_focus, tui_set_win_height)
	(parse_scrolling_args): Remove unnecessary cast.
	* tui/tui-data.c (init_win_info, tui_del_window)
	(tui_free_window, tui_del_data_windows, tui_free_data_content)
	(free_content_elements): Remove unnecessary cast.
	* tui/tui-windata.c (tui_first_data_item_displayed): Remove
	unnecessary cast.
	* tui/tui-source.c (tui_set_source_content)
	(tui_vertical_source_scroll): Remove unnecessary cast.
	* tui/tui-layout.c (tui_default_win_height): Remove unnecessary
	cast.
	* tui/tui-io.c (tui_initialize_io): Remove unnecessary cast.
	* tui/tui-regs.c (tui_display_registers_from)
	(tui_display_register): Remove unnecessary cast.
	* tui/tui-wingeneral.c (tui_refresh_win, tui_delete_win)
	(tui_unhighlight_win, tui_highlight_win, tui_make_window)
	(make_visible): Remove unnecessary cast.
	* tui/tui-winsource.c (tui_erase_source_content)
	(tui_update_breakpoint_info, tui_set_exec_info_content): Remove
	unnecessary cast.
	* ax-gdb.c (agent_command_1): Remove unnecessary cast.
	* cli/cli-setshow.c (cmd_show_list): Remove unnecessary cast.
	* stabsread.c (read_type, read_array_type, read_range_type):
	Remove unnecessary cast.
	* mdebugread.c (mdebug_build_psymtabs): Remove unnecessary cast.
	(parse_symbol, parse_type, upgrade_type, parse_external)
	(parse_partial_symbols, psymtab_to_symtab_1, cross_ref): Remove
	unnecessary cast.
	* gdb_bfd.c (gdb_bfd_map_section): Remove unnecessary cast.

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/valops.c b/gdb/valops.c
index cbf2ecc..948ad89 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -402,12 +402,12 @@ value_cast (struct type *type, struct value *arg2)
 		       "divide object size in cast"));
 	  /* FIXME-type-allocation: need a way to free this type when
 	     we are done with it.  */
-	  range_type = create_static_range_type ((struct type *) NULL,
+	  range_type = create_static_range_type (NULL,
 						 TYPE_TARGET_TYPE (range_type),
 						 low_bound,
 						 new_length + low_bound - 1);
 	  deprecated_set_value_type (arg2, 
-				     create_array_type ((struct type *) NULL,
+				     create_array_type (NULL,
 							element_type, 
 							range_type));
 	  return arg2;
@@ -3816,7 +3816,7 @@ value_slice (struct value *array, int lowbound, int length)
 
   /* FIXME-type-allocation: need a way to free this type when we are
      done with it.  */
-  slice_range_type = create_static_range_type ((struct type *) NULL,
+  slice_range_type = create_static_range_type (NULL,
 					       TYPE_TARGET_TYPE (range_type),
 					       lowbound,
 					       lowbound + length - 1);
@@ -3826,7 +3826,7 @@ value_slice (struct value *array, int lowbound, int length)
     LONGEST offset
       = (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type));
 
-    slice_type = create_array_type ((struct type *) NULL,
+    slice_type = create_array_type (NULL,
 				    element_type,
 				    slice_range_type);
     TYPE_CODE (slice_type) = TYPE_CODE (array_type);