viced: lockcount only valid if not expired

viced: lockcount only valid if not expired

locks are issued on a lease.  If the lock is expired, the lock
count is zero.

Change-Id: I628dd5b8b0d38694d653d9e8e82ff60ec2e1505c
Reviewed-on: http://gerrit.openafs.org/6740
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Alistair Ferguson <alistair.ferguson@mac.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>