Send nfs_export_t to untraverse()

@@ -1318,11 +1318,11 @@
          */
         if ((vp->v_flag & VROOT) || VN_IS_CURZONEROOT(vp)) {
 
                 /* extra hold for vp since untraverse might rele */
                 VN_HOLD(vp);
-                stubvp = untraverse(vp);
+                stubvp = untraverse(nfs_get_export(), vp);
 
                 /*
                  * If vp/stubvp are same, we must be at system-or-zone
                  * root because untraverse returned same vp
                  * for a VROOT object.  sarg->vap was setup