Windows: AFSInsertHashEntry can fail

Windows: AFSInsertHashEntry can fail

If AFSInsertHashEntry() fails, the object information structure
that was being inserted is not in the btree.  Therefore, ensure
that the object does not have the AFS_OBJECT_INSERTED_HASH_TREE
or AFS_VOLUME_INSERTED_HASH_TREE flag set (as appropriate).
This permits the unreferenced object to be garbage collected.

Change-Id: I023f765571a7ba014556d9505ab2d46ec930f1a2
Reviewed-on: http://gerrit.openafs.org/6458
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>