tests: remove unused variable in tests/util/ktime-t.c

tests: remove unused variable in tests/util/ktime-t.c

errors is set but not used - remove it.

Reviewed-on: http://gerrit.openafs.org/7142
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit f971a36968bdcb224ff3ffb663929d4febcab5d5)

Change-Id: I72afced31735012b2832c46d0b4efd83c67c17e2
Reviewed-on: https://gerrit.openafs.org/12373
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Tested-by: Stephan Wiesand <stephan.wiesand@desy.de>