The overlay version of QGraphicsVideoItem crashes when paint() is called with a null pointer widget

When the overlay version of QGraphicsVideoItem is compiled (qgraphicsvideoitem_overlay.cpp), calling QGraphicsVideoItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) with a null-pointer for the QWidget causes a crash, because the implementation unconditionally dereferences the widget:

d->windowControl->setWinId(widget->winId())

The widget parameter is option, so QGraphicsVideoItem shouldn't crash at least.