Unix CM: Catch ICL initialisation failures

If afs_icl_CreateLog fails, don't still call afS_icl_CreateSet.
If afs_icl_CreateSetWithFlags fails, don't ignore its error code.

Caught by clang-analyzer

Reviewed-on: http://gerrit.openafs.org/9203
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 3bbff16c6d34c905fab8fcb792c8606ea356e2a8)

Change-Id: I4835a6cbdc802bc08f5ae83fa10f9c93357cf736
Reviewed-on: http://gerrit.openafs.org/9532
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>