[gdm] Don't destroy shells hash table if we never made it

[Ray Strode <halfline src gnome org>]

commit 57d20b096995029ed4c715e27518729cdd7dade6
Author: Ray Strode <rstrode redhat com>
Date:   Fri Aug 27 17:35:59 2010 -0400

    Don't destroy shells hash table if we never made it

 gui/simple-greeter/gdm-user-manager.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-user-manager.c b/gui/simple-greeter/gdm-user-manager.c
index 0069480..40707b9 100644
--- a/gui/simple-greeter/gdm-user-manager.c
+++ b/gui/simple-greeter/gdm-user-manager.c
@@ -2792,7 +2792,10 @@ gdm_user_manager_finalize (GObject *object)
         if (manager->priv->shells_monitor != NULL) {
                 g_file_monitor_cancel (manager->priv->shells_monitor);
         }
-        g_hash_table_destroy (manager->priv->shells);
+
+        if (manager->priv->shells != NULL) {
+                g_hash_table_destroy (manager->priv->shells);
+        }
 
         G_OBJECT_CLASS (gdm_user_manager_parent_class)->finalize (object);
 }