rfs4_findlockowner
lo = rfs4_findlockowner(&ap->lock_owner, &create);
lo = rfs4_findlockowner(&olo->lock_owner, &lcreate);
lo = rfs4_findlockowner(&args->owner, &create);
extern rfs4_lockowner_t *rfs4_findlockowner(lock_owner4 *, bool_t *);