xen-blkfront: fix missing out label

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index ae5f92b..67d9bfa 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1232,6 +1232,7 @@
 		kfree(info);
 	}
 
+out:
 	unlock_kernel();
 	return 0;
 }