remove peer.linkIn channel and related logic

src/yggdrasil/tcp.go

@@ -209,7 +209,6 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	// Note that multiple connections to the same node are allowed
 	//  E.g. over different interfaces
 	p := iface.core.peers.newPeer(&info.box, &info.sig)
-	p.linkIn = make(chan []byte, 1)
 	p.linkOut = make(chan []byte, 1)
 	in := func(bs []byte) {
 		p.handlePacket(bs)