Fix compiler warnings

src/Mod/Material/Gui/AppearancePreview.cpp

@@ -257,7 +257,9 @@ void AppearancePreview::setTexture(const QImage& image)
 }
 
 void AppearancePreview::setTextureScaling(double scale)
-{}
+{
+    Q_UNUSED(scale)
+}
 
 void AppearancePreview::resetAmbientColor()
 {

src/Mod/Material/Gui/MaterialsEditor.cpp

@@ -898,7 +898,7 @@ bool MaterialsEditor::updateTexturePreview() const
 {
     bool hasImage = false;
     QImage image;
-    double scaling = 99.0;
+    //double scaling = 99.0;
     if (_material->hasModel(Materials::ModelUUIDs::ModelUUID_Rendering_Texture)) {
         // First try loading an embedded image
         try {
@@ -939,7 +939,7 @@ bool MaterialsEditor::updateTexturePreview() const
         try {
             auto property = _material->getAppearanceProperty(QLatin1String("TextureScaling"));
             if (!property->isNull()) {
-                scaling = property->getFloat();
+                //scaling = property->getFloat();
                 // Base::Console().Log("Has 'TextureScaling' = %g\n", scaling);
             }
         }