btrfs: copy_to_sk drop unused root parameter

The root parameter for copy_to_sk is not used at all.
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -1948,8 +1948,7 @@ static noinline int key_in_sk(struct btrfs_key *key,
 	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 @@ static noinline int search_ioctl(struct inode *inode,
 				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)