fix: find free port for torrent

protocol/communities/manager.go

@@ -513,39 +513,42 @@ func (m *Manager) getTCPandUDPport(portNumber int) (int, error) {
 
 	// Find free port
 	for i := 0; i < 10; i++ {
+		port := func() int {
 			tcpAddr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort("localhost", "0"))
 			if err != nil {
 				m.logger.Warn("unable to resolve tcp addr: %v", zap.Error(err))
-			continue
+				return 0
 			}
 
 			tcpListener, err := net.ListenTCP("tcp", tcpAddr)
 			if err != nil {
-			tcpListener.Close()
 				m.logger.Warn("unable to listen on addr", zap.Stringer("addr", tcpAddr), zap.Error(err))
-			continue
+				return 0
 			}
+			defer tcpListener.Close()
 
 			port := tcpListener.Addr().(*net.TCPAddr).Port
-		tcpListener.Close()
 
 			udpAddr, err := net.ResolveUDPAddr("udp", net.JoinHostPort("localhost", fmt.Sprintf("%d", port)))
 			if err != nil {
 				m.logger.Warn("unable to resolve udp addr: %v", zap.Error(err))
-			continue
+				return 0
 			}
 
 			udpListener, err := net.ListenUDP("udp", udpAddr)
 			if err != nil {
-			udpListener.Close()
 				m.logger.Warn("unable to listen on addr", zap.Stringer("addr", udpAddr), zap.Error(err))
-			continue
+				return 0
 			}
+			defer udpListener.Close()
 
-		udpListener.Close()
+			return port
+		}()
 
+		if port != 0 {
 			return port, nil
 		}
+	}
 
 	return 0, fmt.Errorf("no free port found")
 }