gdb: tui_win_name: Make parameter and result const.

This commit makes the parameter and the result for 'tui_win_name'
constant.  There's one place in the code that is then updated as a
result of this change.

gdb/ChangeLog:

	* tui/tui-data.c (tui_partial_win_by_name): Window name is const.
	(tui_win_name): Make parameter and result const.
	* tui/tui-data.h (tui_win_name): Make parameter and result const.

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2015-07-06  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* tui/tui-data.c (tui_partial_win_by_name): Window name is const.
+	(tui_win_name): Make parameter and result const.
+	* tui/tui-data.h (tui_win_name): Make parameter and result const.
+
 2015-07-06  Patrick Palka  <patrick@parcs.ath.cx>
 
 	* i386-tdep.c (i386_mpx_info_bounds): Don't call error, instead

gdb/tui/tui-data.c

@@ -384,7 +384,8 @@ tui_partial_win_by_name (char *name)
 	{
           if (tui_win_list[i] != 0)
             {
-              char *cur_name = tui_win_name (&tui_win_list[i]->generic);
+              const char *cur_name =
+		tui_win_name (&tui_win_list[i]->generic);
 
               if (strlen (name) <= strlen (cur_name)
 		  && startswith (cur_name, name))
@@ -399,8 +400,8 @@ tui_partial_win_by_name (char *name)
 
 
 /* Answer the name of the window.  */
-char *
-tui_win_name (struct tui_gen_win_info *win_info)
+const char *
+tui_win_name (const struct tui_gen_win_info *win_info)
 {
   char *name = (char *) NULL;
 

gdb/tui/tui-data.h

@@ -320,7 +320,7 @@ extern void tui_free_all_source_wins_content (void);
 extern void tui_del_window (struct tui_win_info *);
 extern void tui_del_data_windows (tui_win_content, int);
 extern struct tui_win_info *tui_partial_win_by_name (char *);
-extern char *tui_win_name (struct tui_gen_win_info *);
+extern const char *tui_win_name (const struct tui_gen_win_info *);
 extern enum tui_layout_type tui_current_layout (void);
 extern void tui_set_current_layout_to (enum tui_layout_type);
 extern int tui_term_height (void);