Fix lint errors

src/core/core.go

@@ -158,7 +158,7 @@ func (c *Core) _stop() {
 		c.addPeerTimer.Stop()
 		c.addPeerTimer = nil
 	}
-	c.links.stop()
+	_ = c.links.stop()
 	/* FIXME this deadlocks, need a waitgroup or something to coordinate shutdown
 	for _, peer := range c.GetPeers() {
 		c.DisconnectPeer(peer.Port)

src/core/link.go

@@ -250,15 +250,3 @@ func (intf *link) close() {
 func (intf *link) name() string {
 	return intf.lname
 }
-
-func (intf *link) local() string {
-	return intf.info.local
-}
-
-func (intf *link) remote() string {
-	return intf.info.remote
-}
-
-func (intf *link) interfaceType() string {
-	return intf.info.linkType
-}

src/core/tcp.go

@@ -67,7 +67,7 @@ type tcpOptions struct {
 }
 
 func (l *TcpListener) Stop() {
-	defer func() { recover() }()
+	defer func() { _ = recover() }()
 	close(l.stop)
 }
 
@@ -75,7 +75,7 @@ func (l *TcpListener) Stop() {
 func (t *tcp) setExtraOptions(c net.Conn) {
 	switch sock := c.(type) {
 	case *net.TCPConn:
-		sock.SetNoDelay(true)
+		_ = sock.SetNoDelay(true)
 	// TODO something for socks5
 	default:
 	}