[mutter] meta_stack_update_window_tile_matches(): Fix leaked GList

[Rui Matos <rtcm src gnome org>]

commit 98d427ddbaa75a00197176bb52aa31a30e1917cd
Author: Pavel Vasin <rat4vier gmail com>
Date:   Fri Mar 23 09:58:52 2012 +0400

    meta_stack_update_window_tile_matches(): Fix leaked GList
    
    https://bugzilla.gnome.org/show_bug.cgi?id=672640

 src/core/stack.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/src/core/stack.c b/src/core/stack.c
index 42dd67c..5c31cdf 100644
--- a/src/core/stack.c
+++ b/src/core/stack.c
@@ -257,16 +257,17 @@ void
 meta_stack_update_window_tile_matches (MetaStack     *stack,
                                        MetaWorkspace *workspace)
 {
-  GList *windows;
+  GList *windows, *tmp;
 
   if (stack->freeze_count > 0)
     return;
 
   windows = meta_stack_list_windows (stack, workspace);
-  while (windows)
+  tmp = windows;
+  while (tmp)
     {
-      meta_window_compute_tile_match ((MetaWindow *) windows->data);
-      windows = windows->next;
+      meta_window_compute_tile_match ((MetaWindow *) tmp->data);
+      tmp = tmp->next;
     }
 
   g_list_free (windows);