iocInit: special clear link set in doCloseLinks()

src/ioc/misc/iocInit.c

@@ -647,6 +647,7 @@ static void doCloseLinks(dbRecordType *pdbRecordType, dbCommon *precord,
             /* free link, but don't split lockset like dbDbRemoveLink() */
             free(plink->value.pv_link.pvt);
             plink->type = PV_LINK;
+            plink->lset = NULL;
         }
     }