btrfs: copy_to_sk drop unused root parameter

The root parameter for copy_to_sk is not used at all.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ffb1628..81413e6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1948,8 +1948,7 @@
 	return 1;
 }
 
-static noinline int copy_to_sk(struct btrfs_root *root,
-			       struct btrfs_path *path,
+static noinline int copy_to_sk(struct btrfs_path *path,
 			       struct btrfs_key *key,
 			       struct btrfs_ioctl_search_key *sk,
 			       size_t *buf_size,
@@ -2120,7 +2119,7 @@
 				ret = 0;
 			goto err;
 		}
-		ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
+		ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
 				 &sk_offset, &num_found);
 		btrfs_release_path(path);
 		if (ret)