Send zone's rootvp to untraverse()

*** 414,436 ****
  int
  rfs_climb_crossmnt(vnode_t **dvpp, struct exportinfo **exip, cred_t *cr)
  {
          struct exportinfo *exi;
          vnode_t *dvp = *dvpp;
  
!         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);
          }
  
!         ASSERT3U(exi->exi_zoneid, ==, curzone->zone_id);
          exi_rele(*exip);
          *exip = exi;
          VN_RELE(*dvpp);
          *dvpp = dvp;
  
--- 414,437 ----
  int
  rfs_climb_crossmnt(vnode_t **dvpp, struct exportinfo **exip, cred_t *cr)
  {
          struct exportinfo *exi;
          vnode_t *dvp = *dvpp;
+         vnode_t *zone_rootvp;
  
!         zone_rootvp = (*exip)->exi_ne->exi_root->exi_vp;
!         ASSERT((dvp->v_flag & VROOT) || VN_CMP(zone_rootvp, dvp));
  
          VN_HOLD(dvp);
!         dvp = untraverse(dvp, zone_rootvp);
          exi = nfs_vptoexi(NULL, dvp, cr, NULL, NULL, FALSE);
          if (exi == NULL) {
                  VN_RELE(dvp);
                  return (-1);
          }
  
!         ASSERT3U(exi->exi_zoneid, ==, (*exip)->exi_zoneid);
          exi_rele(*exip);
          *exip = exi;
          VN_RELE(*dvpp);
          *dvpp = dvp;