Fix clazy warning

ktnef/src/ktnefmain.cpp

@@ -410,7 +410,7 @@ void KTNEFMain::extractTo(const QString &dirname)
 void KTNEFMain::contextMenuEvent(QContextMenuEvent *event)
 {
     QList<KTNEFAttach *> list = mView->getSelection();
-    if (!list.count()) {
+    if (list.isEmpty()) {
         return;
     }
 

src/userfeedback/accountinfosource.cpp

@@ -48,7 +48,7 @@ QVariant AccountInfoSource::data()
     int numberOfPop3 = 0;
     int numberOfKolab = 0;
     int numberOfEws = 0;
-    for (Akonadi::AgentInstance type : lst) {
+    for (const Akonadi::AgentInstance &type : lst) {
         const QString identifier = type.identifier();
         if (identifier.startsWith(QLatin1String("akonadi_pop3_resource"))) {
             numberOfPop3++;