If 'btrfs_alloc_path()' fails, we must free the resources already
allocated, as done in the other error handling paths in this function.
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: NQu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>