Avoid warning on empty expressions

For some reason, Q_UNUSED includes already a semicolon, adding one
on the user side creates an additional empty statement.

Change-Id: I9c5e8fac381345a60792cb75e2938fd53958d3b0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/itestframework.h

@@ -50,7 +50,7 @@ public:
     virtual IFrameworkSettings *createFrameworkSettings() const { return nullptr; }
     virtual ITestSettingsPage *createSettingsPage(QSharedPointer<IFrameworkSettings> settings) const
     {
-        Q_UNUSED(settings);
+        Q_UNUSED(settings)
         return nullptr;
     }