[gdm] daemon: fix compiler warning

[Ray Strode <halfline src gnome org>]

commit 47bfbd19caab0df21b53dbe90ca055c7ddeb7151
Author: Ray Strode <rstrode redhat com>
Date:   Wed Aug 1 16:45:32 2012 -0400

    daemon: fix compiler warning

 daemon/gdm-session-worker.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c
index 0e8977e..b050606 100644
--- a/daemon/gdm-session-worker.c
+++ b/daemon/gdm-session-worker.c
@@ -1876,7 +1876,7 @@ gdm_session_worker_open_session (GdmSessionWorker  *worker,
 {
         int error_code;
         int flags;
-        char *session_id;
+        char *session_id = NULL;
 
         g_assert (worker->priv->state == GDM_SESSION_WORKER_STATE_ACCOUNT_DETAILS_SAVED);
         g_assert (geteuid () == 0);