MFV r329710: 8966 Source file zfs_acl.c, function zfs_aclset_common contains a use after end of the lifetime of a local variable

illumos/illumos-gate@82693e09cc02331fa1b3b73b54b1060e73507a8d
https://github.com/illumos/illumos-gate/commit/82693e09cc02331fa1b3b73b54b1060e73507a8d
https://www.illumos.org/issues/8966

Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Andriy Gapon <avg@FreeBSD.org>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author: WHR <msl0000023508@gmail.com>
PR: 225162
Submitted by: WHR <msl0000023508@gmail.com>
Reported by: WHR <msl0000023508@gmail.com>
MFC after: 1 week