Windows: Do not leak cm_volume_t objects from the LRU queue

Windows: Do not leak cm_volume_t objects from the LRU queue

During cm_volume_t object recycling the object is removed
from the LRU to ensure that a single object is not recycled
by multiple threads at the same time.  Before cm_FindVolumeByName()
exits the object must be re-inserted into the LRU if it is not
present.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/3220
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 862e29a98aee72918fc25e960556f732ba80522c)
Change-Id: I11847718cb5321ff2b08850786cc147390040f42
Reviewed-on: http://gerrit.openafs.org/3246
Tested-by: Derrick Brashear <shadow@dementia.org>