XXXXX convert NLM's single-count semaphore to a mutex

*** 309,319 ****
          mip->my_id.my_proc = LX_NLMPROC_NSM_NOTIFY;
          if (op == SM_MON) {
                  bcopy(&host->nh_sysid, args.priv, sizeof (uint16_t));
          }
  
!         sema_p(&nsm->ns_sem);
          nlm_nsm_clnt_init(nsm->ns_handle, nsm);
          if (op == SM_MON) {
                  struct sm_stat_res mres;
  
                  bzero(&mres, sizeof (mres));
--- 309,319 ----
          mip->my_id.my_proc = LX_NLMPROC_NSM_NOTIFY;
          if (op == SM_MON) {
                  bcopy(&host->nh_sysid, args.priv, sizeof (uint16_t));
          }
  
!         mutex_enter(&nsm->ns_lock);
          nlm_nsm_clnt_init(nsm->ns_handle, nsm);
          if (op == SM_MON) {
                  struct sm_stat_res mres;
  
                  bzero(&mres, sizeof (mres));
*** 323,333 ****
  
                  ASSERT(op == SM_UNMON);
                  bzero(&ures, sizeof (ures));
                  stat = sm_unmon_1(mip, &ures, nsm->ns_handle);
          }
!         sema_v(&nsm->ns_sem);
  
          if (stat != RPC_SUCCESS) {
                  NLM_WARN("Failed to contact local statd, stat=%d", stat);
                  if (op == SM_MON) {
                          mutex_enter(&g->lock);
--- 323,333 ----
  
                  ASSERT(op == SM_UNMON);
                  bzero(&ures, sizeof (ures));
                  stat = sm_unmon_1(mip, &ures, nsm->ns_handle);
          }
!         mutex_exit(&nsm->ns_lock);
  
          if (stat != RPC_SUCCESS) {
                  NLM_WARN("Failed to contact local statd, stat=%d", stat);
                  if (op == SM_MON) {
                          mutex_enter(&g->lock);