[mutter] meta-window-group: Fix compile warning

[Adel Gadllah <agadllah src gnome org>]

commit c2af13cf314a1baed7d66073e995d3647ed9dd71
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Thu Jul 18 16:23:27 2013 +0200

    meta-window-group: Fix compile warning

 src/compositor/meta-window-group.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-window-group.c b/src/compositor/meta-window-group.c
index fa30c11..525f987 100644
--- a/src/compositor/meta-window-group.c
+++ b/src/compositor/meta-window-group.c
@@ -155,7 +155,7 @@ meta_window_group_paint (ClutterActor *actor)
       if (!CLUTTER_ACTOR_IS_VISIBLE (child))
         continue;
 
-      if (child == info->unredirected_window)
+      if (META_WINDOW_ACTOR (child) == info->unredirected_window)
         continue;
 
       /* If an actor has effects applied, then that can change the area