[gdm] Don't try to delete a NULL user

[Matthias Clasen <matthiasc src gnome org>]

commit 6eeb747f1b056e6c10ad4390001ae094575d9c94
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 28 23:19:27 2012 -0400

    Don't try to delete a NULL user
    
    It doesn't work. In particular, unreffing NULL is bad news.

 daemon/gdm-simple-slave.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/daemon/gdm-simple-slave.c b/daemon/gdm-simple-slave.c
index b7053ac..0b1bcd0 100644
--- a/daemon/gdm-simple-slave.c
+++ b/daemon/gdm-simple-slave.c
@@ -1197,12 +1197,13 @@ destroy_initial_setup_user (GdmSimpleSlave *slave)
 
         error = NULL;
         user = act_user_manager_get_user (act, INITIAL_SETUP_USERNAME);
-        if (!act_user_manager_delete_user (act, user, TRUE, &error)) {
-                g_warning ("Failed to delete user '%s': %s", INITIAL_SETUP_USERNAME, error->message);
-                g_error_free (error);
+        if (user != NULL) {
+                if (!act_user_manager_delete_user (act, user, TRUE, &error)) {
+                        g_warning ("Failed to delete user '%s': %s", INITIAL_SETUP_USERNAME, error->message);
+                        g_error_free (error);
+                }
+                g_object_unref (user);
         }
-
-        g_object_unref (user);
 }
 
 static void