Thanks for testing. I pushed this fix to libgcrypt master.

Oh, I did not notice the change as I clicked to the patch from mail notification. Trying now with the updated one:

Just to make sure, did you use the updated version of the patch? I edited the message with fix candidate and changed the attachment.

Running scratch build on s390x: https://koji.fedoraproject.org/koji/taskinfo?taskID=119376728 with the proposed change. The failure is now:

Here's fix candidate (edit, new try):