message: [Coverity] Fix missing check for negative return
diff: @@ -669,7 +669,10 @@ void RemoteManager::on_deleteHost_clicked()
  if(res == QMessageBox::Yes)
  {
  - size_t idx = m_Ctx.Config().RemoteHosts.indexOf(host);
  + int32_t idx = m_Ctx.Config().RemoteHosts.indexOf(host);
  + if(idx < 0)
  + return;
  +
  // the host will be removed in queueDelete.
  m_Ctx.Config().RemoteHosts.erase(idx);
  m_Ctx.Config().Save();
  