fix(pstoreds): add missing log for failed GC record unmarshalling in purgeStore() (#3273)

p2p/host/peerstore/pstoreds/addr_book_gc.go

@@ -278,7 +278,7 @@ func (gc *dsAddrBookGc) purgeStore() {
 	for result := range results.Next() {
 		record.Reset()
 		if err = proto.Unmarshal(result.Value, record); err != nil {
-			// TODO log
+			log.Warnf("failed to unmarshal record during GC purge: key=%s, err=%v", result.Key, err)
 			continue
 		}