Corrected two compilation warnings

GUI/coregui/Models/FilterPropertyProxy.cpp

@@ -28,7 +28,7 @@ QModelIndex FilterPropertyProxy::toSourceIndex(QModelIndex index)
     FilterPropertyProxy *proxy = dynamic_cast<FilterPropertyProxy*>(const_cast<QAbstractItemModel*>(index.model()));
     if (proxy)
         return proxy->mapToSource(index);
-    index;
+    return index;
 }
 
 bool FilterPropertyProxy::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const

GUI/coregui/Views/FitWidgets/FitTools.cpp

@@ -175,7 +175,7 @@ void FitTools::onError(const QString &text)
     box.exec();
 }
 
-void FitTools::onUpdatePlots(OutputData<double> *sim, OutputData<double> *chi2)
+void FitTools::onUpdatePlots(OutputData<double> *sim, OutputData<double> *)
 {
     // hack to preserve axis information
     auto data = m_currentJobItem->getIntensityDataItem()->getOutputData()->clone();