zfs: unbreak stable/13 build on i386 after b0c251b0d

The build was broken because upstream merged e76373de7 (author: mav)
without fef8bd41f from openzfs/zfs/master into openzfs/zfs/zfs-2.1-release.

Temporary fix until upstream decides a way to solve this problem.

Patch by: mav
Differential Revision: https://reviews.freebsd.org/D30783

(direct commit)