curzone reality check and teardown changes to use the RIGHT zone

*** 872,881 ****
--- 872,882 ----
  
          avl_index_t             where;  /* used for avl_find()/avl_insert() */
  
          ASSERT(cr != NULL);
  
+         ASSERT3P(curzone, ==, exi->exi_zone);
          nag = zone_getspecific(nfsauth_zone_key, curzone);
  
          /*
           * Now check whether this client already
           * has an entry for this flavor in the cache