Embrace nullptr over NULL and 0

Source/Core/DolphinQt/QtUtils/FlowLayout.cpp

@@ -75,7 +75,7 @@ QLayoutItem* FlowLayout::takeAt(int index)
   if (index >= 0 && index < m_item_list.size())
     return m_item_list.takeAt(index);
   else
-    return 0;
+    return nullptr;
 }
 
 Qt::Orientations FlowLayout::expandingDirections() const
@@ -167,7 +167,7 @@ int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
   else if (parent->isWidgetType())
   {
     QWidget* pw = static_cast<QWidget*>(parent);
-    return pw->style()->pixelMetric(pm, 0, pw);
+    return pw->style()->pixelMetric(pm, nullptr, pw);
   }
   else
   {