Windows: fix Freelance trailing dot enforcement

Windows: fix Freelance trailing dot enforcement

The cm_enforceTrailingDot() function failed if there was a
trailing dot followed by white space.

LICENSE MIT

Change-Id: Ib6a90420459a44b87995c44a5f58fcdcd5041c9f
Reviewed-on: http://gerrit.openafs.org/2588
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit a81c323fbd05cb5cb85c56dfcc0b540e0354f318)
Reviewed-on: http://gerrit.openafs.org/2589
Tested-by: Derrick Brashear <shadow@dementia.org>