[empathy] Fix assertion when closing a call window after CM crashed.

[Guillaume Desmottes <gdesmott src gnome org>]

commit a7439d664bed1547019591dee97b4ed5fa09f434
Author: Mike Ruprecht <mike ruprecht collabora co uk>
Date:   Wed Oct 14 17:47:16 2009 -0500

    Fix assertion when closing a call window after CM crashed.
    
    g_object_unref was called on a NULL pointer.

 src/empathy-call-window.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/empathy-call-window.c b/src/empathy-call-window.c
index 363d294..c274ee2 100644
--- a/src/empathy-call-window.c
+++ b/src/empathy-call-window.c
@@ -1087,10 +1087,9 @@ empathy_call_window_dispose (GObject *object)
     {
       g_signal_handlers_disconnect_by_func (call,
         empathy_call_window_video_stream_changed_cb, object);
+      g_object_unref (call);
     }
 
-  g_object_unref (call);
-
   if (priv->handler != NULL)
     g_object_unref (priv->handler);
   priv->handler = NULL;