[empathy] Only unref the AccountManager if it's not NULL

[Cosimo Cecchi <cosimoc src gnome org>]

commit 9e9c41e83b05829519a4ed5fe1cadd288b74ac8d
Author: Cosimo Cecchi <cosimo cecchi collabora co uk>
Date:   Fri Aug 28 11:16:46 2009 +0200

    Only unref the AccountManager if it's not NULL

 libempathy/empathy-account-manager.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/libempathy/empathy-account-manager.c b/libempathy/empathy-account-manager.c
index 5548a90..f7cb09a 100644
--- a/libempathy/empathy-account-manager.c
+++ b/libempathy/empathy-account-manager.c
@@ -507,7 +507,9 @@ account_manager_name_owner_cb (TpDBusDaemon *proxy,
       /* MC5 quit or crashed for some reason, let's start it again */
       account_manager_start_mc5 (priv->dbus);
 
-      g_object_unref (priv->tp_manager);
+      if (priv->tp_manager != NULL)
+        g_object_unref (priv->tp_manager);
+
       priv->tp_manager = NULL;
       return;
     }