[gnome-session] client: don't try to access client after it's vanished

[Ray Strode <halfline src gnome org>]

commit a8be66fa51e5fe76161f69f2085b6b22192ad451
Author: Ray Strode <rstrode redhat com>
Date:   Wed Mar 9 13:47:16 2016 -0500

    client: don't try to access client after it's vanished
    
    After we emit the disconnected signal on the client it's likely
    to get freed, so don't try to use it from that point forward.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763169

 gnome-session/gsm-dbus-client.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gnome-session/gsm-dbus-client.c b/gnome-session/gsm-dbus-client.c
index 598df4e..e5b9985 100644
--- a/gnome-session/gsm-dbus-client.c
+++ b/gnome-session/gsm-dbus-client.c
@@ -225,9 +225,11 @@ on_client_vanished (GDBusConnection *connection,
                     gpointer         user_data)
 {
         GsmDBusClient  *client = user_data;
-        gsm_client_disconnected (GSM_CLIENT (client));
 
         g_bus_unwatch_name (client->priv->watch_id);
+        client->priv->watch_id = 0;
+
+        gsm_client_disconnected (GSM_CLIENT (client));
 }
 
 static void