[brasero] Fix #592026 - brasero crashes when eject a medium

[Philippe Rouquier <philippr src gnome org>]

commit 34a2d7a4a24543ee0969dcd26d0dcb0fda11e3ae
Author: Philippe Rouquier <bonfire-app wanadoo fr>
Date:   Wed Aug 26 21:15:02 2009 +0200

    Fix #592026 -  brasero crashes when eject a medium
    Patch by Lin Ma <lin ma sun com>

 libbrasero-media/brasero-drive.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/libbrasero-media/brasero-drive.c b/libbrasero-media/brasero-drive.c
index 09118b2..a5da76f 100644
--- a/libbrasero-media/brasero-drive.c
+++ b/libbrasero-media/brasero-drive.c
@@ -234,11 +234,13 @@ brasero_drive_eject (BraseroDrive *drive,
 
 	BRASERO_MEDIA_LOG ("Trying to eject volume");
 	gvolume = brasero_volume_get_gvolume (BRASERO_VOLUME (priv->medium));
-	res = brasero_gio_operation_eject_volume (gvolume,
-						  priv->cancel,
-						  wait,
-						  error);
-	g_object_unref (gvolume);
+	if (gvolume) {
+		res = brasero_gio_operation_eject_volume (gvolume,
+							  priv->cancel,
+							  wait,
+							  error);
+		g_object_unref (gvolume);
+	}
 
 	return res;
 }