Fix warning about unused parameter

Change-Id: I2844ebae2cd834b187f01b62d414692aa29b0605
Reviewed-on: http://codereview.qt.nokia.com/354

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@nokia.com>

src/plugins/qmljstools/qmljscodestylesettingsfactory.cpp

@@ -24,6 +24,7 @@ QString QmlJSCodeStylePreferencesFactory::displayName()
 TextEditor::IFallbackPreferences *QmlJSCodeStylePreferencesFactory::createPreferences(
     const QList<TextEditor::IFallbackPreferences *> &fallbacks) const
 {
+    Q_UNUSED(fallbacks);
     return 0;
 }