Windows: AFSClose remove dead code

Reviewed-on: http://gerrit.openafs.org/9889
Reviewed-by: Peter Scott <pscott@kerneldrivers.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 6c42bc9090324a5ce57678b31b76ad5ef8ed1d34)

Change-Id: I61c0f1d1280bd2adbb70a2d73ec34201bbc7dfa3
Reviewed-on: http://gerrit.openafs.org/9895
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>