PATCH: PR tui/14486: resize crashes tui

[H.J. Lu]

This patch checks if TUI_SRC_WIN is not NULL before referencing it.  OK
to install?

Thanks.


H.J.
----
2010-08-17  H.J. Lu  <hongjiu.lu@intel.com>

	PR tui/14486
	* tui/tui-source.c (tui_source_is_displayed): Check if TUI_SRC_WIN
	is not NULL before referencing it.

diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 9ba9b1d..030653c 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -334,7 +334,8 @@ tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s,
 int
 tui_source_is_displayed (char *fname)
 {
-  return (TUI_SRC_WIN->generic.content_in_use 
+  return (TUI_SRC_WIN != NULL
+	  && TUI_SRC_WIN->generic.content_in_use 
 	  && (filename_cmp (((struct tui_win_element *)
 			     (tui_locator_win_info_ptr ())->
 			     content[0])->which_element.locator.file_name,