[gnome-settings-daemon] housekeeping: Don't crash on exit

[Bastien Nocera <hadess src gnome org>]

commit dcfe290500e0d68a71f09e576e28c09f7572cef6
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Sep 21 13:46:34 2012 +0200

    housekeeping: Don't crash on exit
    
    If a notification popup was shown, and then dismissed, notification
    wouldn't have been reset, and we would crash on exit trying to
    dismiss it.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=859383
    https://bugzilla.gnome.org/show_bug.cgi?id=684548

 plugins/housekeeping/gsd-disk-space.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/housekeeping/gsd-disk-space.c b/plugins/housekeeping/gsd-disk-space.c
index 4c6b3c5..51e4a8e 100644
--- a/plugins/housekeeping/gsd-disk-space.c
+++ b/plugins/housekeeping/gsd-disk-space.c
@@ -294,6 +294,7 @@ static void
 on_notification_closed (NotifyNotification *notification)
 {
         g_object_unref (notification);
+        notificaton = NULL;
 }
 
 static gboolean