[gdm] user-chooser-widget: fix ref counting issue on user pixbuf

[Ray Strode <halfline src gnome org>]

commit fc61e0d2b9b18c9aca60f4bcb922c5dd84e8e3d2
Author: Ray Strode <rstrode redhat com>
Date:   Wed Jan 19 13:32:28 2011 -0500

    user-chooser-widget: fix ref counting issue on user pixbuf

 gui/simple-greeter/gdm-user-chooser-widget.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-user-chooser-widget.c b/gui/simple-greeter/gdm-user-chooser-widget.c
index 6d03c38..9447e59 100644
--- a/gui/simple-greeter/gdm-user-chooser-widget.c
+++ b/gui/simple-greeter/gdm-user-chooser-widget.c
@@ -949,7 +949,14 @@ update_icons (GdmChooserWidget *widget,
               IconUpdateData   *data)
 {
         if (data->old_icon == *image) {
+                if (*image != NULL) {
+                        g_object_unref (*image);
+                }
                 *image = data->new_icon;
+
+                if (*image != NULL) {
+                        g_object_ref (*image);
+                }
                 return TRUE;
         }