Caution with use after exi_rele()

*** 533,542 ****
--- 533,543 ----
           */
          if (PUBLIC_FH2(fhp)) {
                  publicfh_flag = TRUE;
  
                  exi_rele(exi);
+                 exi = NULL;
  
                  error = rfs_publicfh_mclookup(name, dvp, cr, &vp, &exi,
                      &sec);
          } else {
                  /*