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

@@ -309,11 +309,11 @@
         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);
+        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));

@@ -323,11 +323,11 @@
 
                 ASSERT(op == SM_UNMON);
                 bzero(&ures, sizeof (ures));
                 stat = sm_unmon_1(mip, &ures, nsm->ns_handle);
         }
-        sema_v(&nsm->ns_sem);
+        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);