12505 Answer KEBE question about cred in unexport()

*** 658,668 ****
                  fid.fid_len = MAXFIDSZ;
                  error = vop_fid_pseudo(vp, &fid);
                  if (error)
                          break;
  
-                 /* XXX KEBE ASKS DO WE NEED THIS?!? */
                  ASSERT3U(exip->exi_zoneid, ==, curzone->zone_id);
                  /*
                   * The root of the file system, or the zone's root for
                   * in-zone NFS service needs special handling
                   */
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