Windows: osisleep cleanup

Change-Id: Id76989dfab53a166a4174569973fb0a5f5e5e972
Reviewed-on: http://gerrit.openafs.org/8968
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>