p2p: remove unused code (#20325)

p2p/server.go

@@ -199,7 +199,6 @@ type Server struct {
 	checkpointAddPeer       chan *conn
 
 	// State of run loop and listenLoop.
-	lastLookup     time.Time
 	inboundHistory expHeap
 }
 
@@ -410,7 +409,7 @@ type sharedUDPConn struct {
 func (s *sharedUDPConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
 	packet, ok := <-s.unhandled
 	if !ok {
-		return 0, nil, errors.New("Connection was closed")
+		return 0, nil, errors.New("connection was closed")
 	}
 	l := len(packet.Data)
 	if l > len(b) {