[brasero] Silenced a warning

[Philippe Rouquier <philippr src gnome org>]

commit cdb870455c6ed162209379b48f47e40d1886e75a
Author: Philippe Rouquier <bonfire-app wanadoo fr>
Date:   Wed Nov 24 15:29:01 2010 +0100

    Silenced a warning

 libbrasero-burn/brasero-session.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libbrasero-burn/brasero-session.c b/libbrasero-burn/brasero-session.c
index fa67cca..73d8642 100644
--- a/libbrasero-burn/brasero-session.c
+++ b/libbrasero-burn/brasero-session.c
@@ -2059,7 +2059,7 @@ brasero_burn_session_get_src_medium (BraseroBurnSession *self)
 		return NULL;
 
 	track = priv->tracks->data;
-	if (!BRASERO_TRACK_DISC (track))
+	if (!BRASERO_IS_TRACK_DISC (track))
 		return NULL;
 
 	drive = brasero_track_disc_get_drive (BRASERO_TRACK_DISC (track));