Illumos #4208

4208 Typo in zfs_main.c: "posxiuser"

Reviewed by: Sonu Pillai <sonu.pillai@delphix.com>
Reviewed by: Will Guyette <will.guyette@delphix.com>
Reviewed by: Eric Diven <eric.diven@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

References:

https://www.illumos.org/issues/4208
illumos/illumos-gate@f38cb554a534c6df738be3f4d23327e69888e634

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1986