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/valgrind/suppressiondialog.cpp

@@ -227,7 +227,7 @@ void SuppressionDialog::accept()
     foreach (const QModelIndex &index, indices) {
         bool removed = model->removeRow(index.row());
         QTC_ASSERT(removed, qt_noop());
-        Q_UNUSED(removed);
+        Q_UNUSED(removed)
     }
 
     // One suppression might hide multiple rows, care for that.