[empathy] Check for NULL sink.

[Cosimo Cecchi <cosimoc src gnome org>]

commit f3b365193241950efbe62737bcf049ac7d66d9c4
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Sep 14 16:29:26 2009 +0200

    Check for NULL sink.

 src/empathy-call-window.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/empathy-call-window.c b/src/empathy-call-window.c
index 92c74b7..e7cbadc 100644
--- a/src/empathy-call-window.c
+++ b/src/empathy-call-window.c
@@ -2225,6 +2225,9 @@ empathy_call_window_volume_changed_cb (GtkScaleButton *button,
 {
   EmpathyCallWindowPriv *priv = GET_PRIV (window);
 
+  if (priv->audio_output == NULL)
+    return;
+
   empathy_audio_sink_set_volume (EMPATHY_GST_AUDIO_SINK (priv->audio_output),
     value);
 }