[totem] Fix warning when creating a screenshot

[Bastien Nocera <hadess src gnome org>]

commit f2c5681680e8ea377b65d2536d6d7be25fed39b6
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Oct 16 18:25:13 2009 +0100

    Fix warning when creating a screenshot
    
    The buffer is a GstMiniObject, not a GObject.

 src/backend/gstscreenshot.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/backend/gstscreenshot.c b/src/backend/gstscreenshot.c
index 6bdd3f1..c25038f 100644
--- a/src/backend/gstscreenshot.c
+++ b/src/backend/gstscreenshot.c
@@ -195,7 +195,7 @@ bvw_frame_conv_convert (GstBuffer * buf, GstCaps * to_caps)
   gst_object_unref (pipeline);
 
 bail:
-  g_object_unref (buf);
+  gst_buffer_unref (buf);
 
   return result;
 }