Btrfs: d_type optimization

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 85616b4..645a422 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1264,6 +1264,7 @@
 	}
 	ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0,
 				 data);
+	BUG_ON(ret);
 	return 0;
 }