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

Change-Id: I3feb3fb55beddffdbbf52a79efcc8d44af39b891
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>