map_unset
ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
*result = map_unset(regp, getowner(rqstp->rq_xprt, owner));
bool_t map_unset(RPCB *, char *);