Send nfs_export_t to untraverse()

*** 419,429 ****
  
          ASSERT3U((*exip)->exi_zoneid, ==, curzone->zone_id);
          ASSERT((dvp->v_flag & VROOT) || VN_IS_CURZONEROOT(dvp));
  
          VN_HOLD(dvp);
!         dvp = untraverse(dvp);
          exi = nfs_vptoexi(NULL, dvp, cr, NULL, NULL, FALSE);
          if (exi == NULL) {
                  VN_RELE(dvp);
                  return (-1);
          }
--- 419,429 ----
  
          ASSERT3U((*exip)->exi_zoneid, ==, curzone->zone_id);
          ASSERT((dvp->v_flag & VROOT) || VN_IS_CURZONEROOT(dvp));
  
          VN_HOLD(dvp);
!         dvp = untraverse((*exip)->exi_ne, dvp);
          exi = nfs_vptoexi(NULL, dvp, cr, NULL, NULL, FALSE);
          if (exi == NULL) {
                  VN_RELE(dvp);
                  return (-1);
          }