[gdm] Only get username in the simple-slave if the session is not NULL.

[Brian Cameron <bcameron src gnome org>]

commit ac8a754bfc6675be66bddfb551dde7acec355d20
Author: Brian Cameron <Brian Cameron Oracle COM>
Date:   Thu May 19 18:38:33 2011 -0500

    Only get username in the simple-slave if the session is not NULL.

 daemon/gdm-simple-slave.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-simple-slave.c b/daemon/gdm-simple-slave.c
index 1feef46..13987ed 100644
--- a/daemon/gdm-simple-slave.c
+++ b/daemon/gdm-simple-slave.c
@@ -437,7 +437,10 @@ stop_greeter (GdmSimpleSlave *slave)
         }
 
         /* Run the PostLogin script. gdmslave suspends until script has terminated */
-        username = gdm_session_direct_get_username (slave->priv->session);
+        username = NULL;
+        if (slave->priv->session != NULL) {
+                username = gdm_session_direct_get_username (slave->priv->session);
+        }
 
         if (username != NULL) {
                 gdm_slave_run_script (GDM_SLAVE (slave), GDMCONFDIR "/PostLogin", username);