Remove a call to update_exec_info

tui_show_frame_info calls update_exec_info after calling
erase_source_content, but there's no need to do this, as
erase_source_content already clears the exec info.

gdb/ChangeLog
2019-12-20  Tom Tromey  <tom@tromey.com>

	* tui/tui-stack.c (tui_show_frame_info): Don't call
	update_exec_info.

Change-Id: I63d658561028ac1bc0a0a2b7ac17da1b9c6134fe

gdb/ChangeLog

+2019-12-20  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-stack.c (tui_show_frame_info): Don't call
+	update_exec_info.
+
 2019-12-20  Tom Tromey  <tom@tromey.com>
 	* tui/tui.c (tui_enable): Call tui_display_main.

gdb/tui/tui-stack.c

@@ -362,10 +362,7 @@ tui_show_frame_info (struct frame_info *fi)
 	return 0;
 
       for (struct tui_source_window_base *win_info : tui_source_windows ())
-	{
-	  win_info->erase_source_content ();
-	  win_info->update_exec_info ();
-	}
+	win_info->erase_source_content ();
 
       return 1;
     }