zfs: merge openzfs/zfs@a4bf6baae
Notable upstream pull request merges:
#15630 a4bf6baae FreeBSD: Fix file descriptor leak on pool import
#15780 d9cb42da9 FreeBSD: Fix bootstrapping tools under Linux/musl
Obtained from: OpenZFS
OpenZFS commit: a4bf6baaeb70a01a4c13fd6139ebdc97bad172e9