message: net: don't check if the listening socket is valid
  Listening sockets in `CConnman::vhListenSocket` are always valid
  (underlying file descriptor is not `INVALID_SOCKET`).
diff: @@ -1642,7 +1642,7 @@ void CConnman::SocketHandlerListening(const std::set<SOCKET>& recv_set)
  if (interruptNet) {
  return;
  }
  - if (listen_socket.socket != INVALID_SOCKET && recv_set.count(listen_socket.socket) > 0) {
  + if (recv_set.count(listen_socket.socket) > 0) {
  AcceptConnection(listen_socket);
  }
  }
  