git: 8170eb6ebcf2..ea076d6921d0 - vendor/openzfs/master - vendor branch updated

From: Martin Matuska <mm_at_FreeBSD.org>
Date: Fri, 27 Jun 2025 02:37:22 UTC
The branch vendor/openzfs/master has been updated by mm:

URL: https://cgit.FreeBSD.org/src/log/?id=8170eb6ebcf2..ea076d6921d0

48ce292ea06e Clarify and restrict dmu_tx_assign() errors
46a407510054 Linux 6.16: remove writepage and readahead_page
d461a67d0a05 Ensure that gang_copies is always at least as large as copies
0a2163d194e3 FreeBSD: Ensure that z_pflags is initialized for new znodes
ea076d6921d0 vdev_raidz_asize_to_psize: return psize, not asize