fix lint

Author: andrepatta

prl/downloader/downloader.go

@@ -78,7 +78,6 @@ var (
 	errCanceled                = errors.New("syncing canceled (requested)")
 	errTooOld                  = errors.New("peer's protocol version too old")
 	errNoAncestorFound         = errors.New("no common ancestor found")
-	errNoPivotHeader           = errors.New("pivot header is not found")
 )
 
 // peerDropFn is a callback type for dropping a peer detected as malicious.
@@ -1619,25 +1618,3 @@ func (d *Downloader) DeliverSnapPacket(peer *snap.Peer, packet snap.Packet) erro
 		return fmt.Errorf("unexpected snap packet type: %T", packet)
 	}
 }
-
-// readHeaderRange returns a list of headers, using the given last header as the base,
-// and going backwards towards genesis. This method assumes that the caller already has
-// placed a reasonable cap on count.
-func (d *Downloader) readHeaderRange(last *types.Header, count int) []*types.Header {
-	var (
-		current = last
-		headers []*types.Header
-	)
-	for {
-		parent := d.lightchain.GetHeaderByHash(current.ParentHash)
-		if parent == nil {
-			break // The chain is not continuous, or the chain is exhausted
-		}
-		headers = append(headers, parent)
-		if len(headers) >= count {
-			break
-		}
-		current = parent
-	}
-	return headers
-}

prl/sync.go

@@ -65,7 +65,6 @@ type chainSyncer struct {
 	handler     *handler
 	force       *time.Timer
 	forced      bool // true when force timer fired
-	warned      time.Time
 	peerEventCh chan struct{}
 	doneCh      chan error // non-nil when sync is running
 }