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/qmlprofiler/qmlprofilertracefile.cpp

@@ -123,7 +123,7 @@ QmlProfilerTraceFile::QmlProfilerTraceFile(QObject *parent) : Timeline::Timeline
         qRegisterMetaType<QVector<QmlEventType> >(),
         qRegisterMetaType<QVector<QmlNote> >()
     };
-    Q_UNUSED(meta);
+    Q_UNUSED(meta)
 }
 
 void QmlProfilerTraceFile::load(QIODevice *device)
@@ -834,7 +834,7 @@ void QmlProfilerTraceFile::saveQzt(QIODevice *device)
 
     qint64 lastProgressTimestamp = traceStart();
     modelManager()->replayQmlEvents([&](const QmlEvent &event, const QmlEventType &type) {
-        Q_UNUSED(type);
+        Q_UNUSED(type)
         bufferStream << event;
         // 32MB buffer should be plenty for efficient compression
         if (buffer.data().length() > (1 << 25)) {