[gtk+/wip/gmenu] GtkApplicationWindow: Don't unref a NULL object

[Colin Walters <walters src gnome org>]

commit e536582f8333629d0e532ad9a96946d521c5ec0c
Author: Colin Walters <walters verbum org>
Date:   Thu Dec 1 13:29:41 2011 -0500

    GtkApplicationWindow: Don't unref a NULL object

 gtk/gtkapplicationwindow.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkapplicationwindow.c b/gtk/gtkapplicationwindow.c
index 1c47330..7d04770 100644
--- a/gtk/gtkapplicationwindow.c
+++ b/gtk/gtkapplicationwindow.c
@@ -492,8 +492,9 @@ recalculate_app_menu_state (GtkApplicationWindow *window)
     }
   else
     {
-      gtk_widget_unparent (GTK_WIDGET (window->priv->menubar));
-      g_object_unref (window->priv->menubar);
+      if (window->priv->menubar)
+	gtk_widget_unparent (GTK_WIDGET (window->priv->menubar));
+      g_clear_object (&window->priv->menubar);
     }
 }