btrfs: qgroup: Drop root parameter from btrfs_qgroup_trace_subtree

The fs_info can be fetched from the transaction handle directly.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index b98d7a5..d6bcf55 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1879,13 +1879,12 @@ int replace_path(struct btrfs_trans_handle *trans,
 		 *    and tree block numbers, if current trans doesn't free
 		 *    data reloc tree inode.
 		 */
-		ret = btrfs_qgroup_trace_subtree(trans, src, parent,
+		ret = btrfs_qgroup_trace_subtree(trans, parent,
 				btrfs_header_generation(parent),
 				btrfs_header_level(parent));
 		if (ret < 0)
 			break;
-		ret = btrfs_qgroup_trace_subtree(trans, dest,
-				path->nodes[level],
+		ret = btrfs_qgroup_trace_subtree(trans, path->nodes[level],
 				btrfs_header_generation(path->nodes[level]),
 				btrfs_header_level(path->nodes[level]));
 		if (ret < 0)