[gdm/gnome-2-30] Fix bug #650659 - double free issue in chooser.

[Brian Cameron <bcameron src gnome org>]

commit f33b0e8ccac7aa1719af42ec268071c8dcf6a395
Author: Brian Cameron <brian cameron oracle com>
Date:   Thu Jun 2 09:50:50 2011 -0500

    Fix bug #650659 - double free issue in chooser.

 gui/simple-greeter/gdm-chooser-widget.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-chooser-widget.c b/gui/simple-greeter/gdm-chooser-widget.c
index d4b0a4a..3c6ec4c 100644
--- a/gui/simple-greeter/gdm-chooser-widget.c
+++ b/gui/simple-greeter/gdm-chooser-widget.c
@@ -2355,6 +2355,7 @@ gdm_chooser_widget_lookup_item (GdmChooserWidget *widget,
 
         if (active_item_id == NULL || strcmp (active_item_id, id) != 0) {
                 g_free (active_item_id);
+                active_item_id = NULL;
 
                 if (!find_item (widget, id, &iter)) {
                         return FALSE;