p2p: good will assumption for the DAO fork

eth/handler.go

@@ -405,25 +405,24 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "msg %v: %v", msg, err)
 		}
 		// Filter out any explicitly requested headers, deliver the rest to the downloader
-		isForkCheck := len(headers) == 1
-		if isForkCheck {
+		if len(headers) == 0 || len(headers) == 1 {
 			if p.timeout != nil {
 				// Disable the fork drop timeout
 				p.timeout.Stop()
 				p.timeout = nil
 			}
+		}
+		if len(headers) == 1 {
 			if err := pm.chainConfig.HeaderCheck(headers[0]); err != nil {
 				pm.removePeer(p.id)
 				return err
 			}
 			// Irrelevant of the fork checks, send the header to the fetcher just in case
 			headers = pm.fetcher.FilterHeaders(headers, time.Now())
 		}
-		if len(headers) > 0 || !isForkCheck {
-			err := pm.downloader.DeliverHeaders(p.id, headers)
-			if err != nil {
-				glog.V(logger.Debug).Infoln(err)
-			}
+		err := pm.downloader.DeliverHeaders(p.id, headers)
+		if err != nil {
+			glog.V(logger.Debug).Infoln(err)
 		}
 
 	case p.version >= eth62 && msg.Code == GetBlockBodiesMsg: