rx: clear call_queue_lock after removing call from queue

rx: clear call_queue_lock after removing call from queue

The call_queue_lock is set to either rx_serverPool_lock or
rx_freeCallQueue_lock, depending on whether an rx_call resides in the
rx_incomingCallQueue or the rx_freeCallQueue, respectively.  This value
is used by rxi_ResetCall to lock the appropriate queue before removing a
call.  Therefore, the call_queue_lock should be cleared after a call is
removed from a queue.

This issue has no known external symptoms; however, repairing this is
helpful to developers examining core files.

Repair two instances where the call_queue_lock is not cleared.

Change-Id: Id1d9ac8454c1e07c10766dffb2a2beac7122bf3e
Reviewed-on: https://gerrit.openafs.org/13641
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>