curzone reality check and teardown changes to use the RIGHT zone

@@ -2565,11 +2565,17 @@
 nlm_unexport(struct exportinfo *exi)
 {
         struct nlm_globals *g;
         struct nlm_host *hostp;
 
-        g = zone_getspecific(nlm_zone_key, curzone);
+        /* This may be called on behalf of global-zone doing shutdown. */
+        ASSERT(exi->exi_zone == curzone || curzone == global_zone);
+        g = zone_getspecific(nlm_zone_key, exi->exi_zone);
+        if (g == NULL) {
+                /* Did zone cleanup get here already? */
+                return;
+        }
 
         mutex_enter(&g->lock);
         hostp = avl_first(&g->nlm_hosts_tree);
         while (hostp != NULL) {
                 struct nlm_vhold *nvp;