Btrfs: remove unused argument of btrfs_extend_item()

Argument 'trans' is not used in btrfs_extend_item().

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 3442dd9..52287ec 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -410,7 +410,7 @@
 		if (found_size > item_size)
 			btrfs_truncate_item(root, path, item_size, 1);
 		else if (found_size < item_size)
-			btrfs_extend_item(trans, root, path,
+			btrfs_extend_item(root, path,
 					  item_size - found_size);
 	} else if (ret) {
 		return ret;