message: Fix null pointer dereferencing in swServer_confirm()
  Reference: Coverity CID
diff: @@ -892,7 +892,7 @@ int swServer_udp_send(swServer *serv, swSendData *resp)
  int swServer_confirm(swServer *serv, int fd)
  {
  swConnection *conn = swServer_connection_verify(serv, fd);
  - if (!conn && !conn->listen_wait)
  + if (!conn || !conn->listen_wait)
  {
  return SW_ERR;
  }
  