link: not pv_link backend type

informational, and a hint at what pvt points to

src/ioc/db/dbLink.c

@@ -172,6 +172,7 @@ static long dbDbInitLink(struct link *plink, short dbfType)
     pdbAddr = dbCalloc(1, sizeof(struct dbAddr));
     *pdbAddr = dbaddr; /* structure copy */
     plink->value.pv_link.pvt = pdbAddr;
+    plink->value.pv_link.backend = "db";
     ellAdd(&dbaddr.precord->bklnk, &plink->value.pv_link.backlinknode);
     /* merging into the same lockset is deferred to the caller.
      * cf. initPVLinks()
@@ -186,6 +187,7 @@ static void dbDbAddLink(dbLocker *locker, struct link *plink, short dbfType, DBA
     plink->lset = &dbDb_lset;
     plink->type = DB_LINK;
     plink->value.pv_link.pvt = ptarget;
+    plink->value.pv_link.backend = "db";
     ellAdd(&ptarget->precord->bklnk, &plink->value.pv_link.backlinknode);
 
     /* target record is already locked in dbPutFieldLink() */
@@ -196,6 +198,7 @@ static void dbDbRemoveLink(dbLocker *locker, struct link *plink)
 {
     DBADDR *pdbAddr = (DBADDR *) plink->value.pv_link.pvt;
     plink->value.pv_link.pvt = 0;
+    plink->value.pv_link.backend = NULL;
     plink->value.pv_link.getCvt = 0;
     plink->value.pv_link.pvlMask = 0;
     plink->value.pv_link.lastGetdbrType = 0;

src/ioc/dbStatic/link.h

@@ -85,6 +85,7 @@ struct pv_link {
     LINKCVT	getCvt;		/* input conversion function */
     short	pvlMask;	/* Options mask */
     short	lastGetdbrType;	/* last dbrType for DB or CA get */
+    const char *backend;/* informational string describing the backend */
 };
 
 /* structure of a VME io channel */

src/ioc/misc/iocInit.c

@@ -641,8 +641,7 @@ static void doCloseLinks(dbRecordType *pdbRecordType, dbCommon *precord,
                 dbScanLock(precord);
                 locked = 1;
             }
-            if(plink->lset)
-                (*plink->lset->removeLink)(NULL, plink);
+            dbRemoveLink(NULL, plink);
 
         } else if (iocBuildMode==buildIsolated && plink->type == DB_LINK) {
             /* free link, but don't split lockset like dbDbRemoveLink() */