license: gplv2 or gplv2+?

[pypingou]

Hi,

Quick question: is the project under GPLv2 only or GPLv2+?

The README says: This project is licensed under the GPL-2.0-only but all the SPDX-License-Identifier I found say: GPL-2.0-or-later

Thanks!

[pypingou]

Maybe the integration of https://github.com/westerndigitalcorporation/ufs-utils/blob/dev/hmac_sha2.h is what makes the entire project GPLv2 only even though most of the code is GPLv2+?