Fix compilation with Intel CC: Q_UNUSED takes a reference

in qglobal.h, we make Q_UNUSED call a template function that takes T&
as a parameter. So we can't pass an rvalue (the result of the &&
operator).

Reviewed-By: Trust Me

src/plugins/help/helpviewer_qwv.cpp

@@ -341,7 +341,8 @@ bool HelpViewer::isBackwardAvailable() const
 bool HelpViewer::findText(const QString &text, Find::FindFlags flags,
     bool incremental, bool fromSearch)
 {
-    Q_UNUSED((incremental && fromSearch))
+    Q_UNUSED(incremental);
+    Q_UNUSED(fromSearch);
     QWebPage::FindFlags options = QWebPage::FindWrapsAroundDocument;
     if (flags & Find::FindBackward)
         options |= QWebPage::FindBackward;