[mutter] screen: don't use unreffed pointer

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 78dc480e869caecf03d7d5bdbec63c4231481082
Author: Lionel Landwerlin <lionel g landwerlin linux intel com>
Date:   Wed Mar 7 21:32:34 2012 +0000

    screen: don't use unreffed pointer

 src/core/screen.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index ba2b967..5145df5 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -1492,7 +1492,7 @@ meta_screen_remove_workspace (MetaScreen *screen, MetaWorkspace *workspace,
   /* If deleting a workspace before the current workspace, the active
    * workspace index changes, so we need to update that hint */
   if (active_index_changed)
-      meta_screen_set_active_workspace_hint (workspace->screen);
+      meta_screen_set_active_workspace_hint (screen);
 
   l = next;
   while (l)