message: Fix variable shadowing in qt/optionsdialog.cpp
  qt/optionsdialog.cpp:124:44: warning: declaration shadows a field of 'OptionsDialog' [-Wshadow]
  void OptionsDialog::setModel(OptionsModel *model)
  ^
  ./qt/optionsdialog.h:71:19: note: previous declaration is here
  OptionsModel *model;
  ^
diff: @@ -121,22 +121,22 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet)
  }
  OptionsDialog::~OptionsDialog() { delete ui; }
  -void OptionsDialog::setModel(OptionsModel *model)
  +void OptionsDialog::setModel(OptionsModel *_model)
  {
  - this->model = model;
  + this->model = _model;
  - if (model)
  + if (_model)
  {
  /* check if client restart is needed and show persistent message */
  - if (model->isRestartRequired())
  + if (_model->isRestartRequired())
  showRestartWarning(true);
  - QString strLabel = model->getOverriddenByCommandLine();
  + QString strLabel = _model->getOverriddenByCommandLine();
  if (strLabel.isEmpty())
  strLabel = tr("none");
  ui->overriddenByCommandLineLabel->setText(strLabel);
  - mapper->setModel(model);
  + mapper->setModel(_model);
  setMapper();
  mapper->toFirst();
  