remove extra message

Author: unclezoro

eth/protocols/diff/handshake.go

@@ -20,6 +20,8 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/ethereum/go-ethereum/rlp"
+
 	"github.com/ethereum/go-ethereum/common/gopool"
 	"github.com/ethereum/go-ethereum/p2p"
 )
@@ -40,6 +42,7 @@ func (p *Peer) Handshake(diffSync bool) error {
 	gopool.Submit(func() {
 		errc <- p2p.Send(p.rw, DiffCapMsg, &DiffCapPacket{
 			DiffSync: diffSync,
+			Extra:    rlp.RawValue{},
 		})
 	})
 	gopool.Submit(func() {