[PATCH libaio 27/28] harness: Print better error messages on error conditions in...

[PATCH libaio 27/28] harness: Print better error messages on error conditions in 22.t

These should help diagnose problems when dealing with error failures.
In particular this helped distinguish the problem with io_pgetevents()
not being implemented and it failing due to the sigset_t layout bug.

Signed-off-by: Guillem Jover <guillem@hadrons.org>
[JEM: fix up 80 columns violations]
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Gbp-Pq: Topic upstream
Gbp-Pq: Name 0027-harness-Print-better-error-messages-on-error-conditi.patch