[gnome-control-center/gnome-3-8] sound: Update to libgnome-volume-control master

[Bastien Nocera <hadess src gnome org>]

commit 291df5347cdcb76224c213f20effae2c08043007
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Mar 26 18:20:07 2013 +0100

    sound: Update to libgnome-volume-control master

 panels/sound/gvc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/sound/gvc b/panels/sound/gvc
index 74c0862..ed0ec42 160000
--- a/panels/sound/gvc
+++ b/panels/sound/gvc
@@ -1 +1 @@
-Subproject commit 74c08620b45a806df7531a434449f612c87c5ea4
+Subproject commit ed0ec4240125ac9f0a6d7502aa29644d37b2eac2