[mutter] window-actor: Use g_clear_pointer

[Jasper St. Pierre <jstpierre src gnome org>]

commit 9d8e7371fb03c640c4c9a1caa5bdd37b10e2ade2
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Aug 28 11:11:04 2013 -0400

    window-actor: Use g_clear_pointer

 src/compositor/meta-window-actor.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 1d90114..db01638 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -2236,11 +2236,7 @@ check_needs_reshape (MetaWindowActor *self)
   if (!priv->needs_reshape)
     return;
 
-  if (priv->shadow_shape != NULL)
-    {
-      meta_window_shape_unref (priv->shadow_shape);
-      priv->shadow_shape = NULL;
-    }
+  g_clear_pointer (&priv->shadow_shape, meta_window_shape_unref);
 
   meta_frame_calc_borders (priv->window->frame, &borders);