qgv: fix -Wunused-parameters

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>

QGVCore/QGVEdge.cpp

@@ -59,7 +59,7 @@ void QGVEdge::setLabel(const QString &label)
     setAttribute("xlabel", label);
 }
 
-void QGVEdge::paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
+void QGVEdge::paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *)
 {
     painter->save();
 

QGVCore/QGVNode.cpp

@@ -49,7 +49,7 @@ QRectF QGVNode::boundingRect() const
     return _path.boundingRect();
 }
 
-void QGVNode::paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
+void QGVNode::paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *)
 {
     painter->save();
 

QGVCore/QGVSubGraph.cpp

@@ -83,7 +83,7 @@ QRectF QGVSubGraph::boundingRect() const
     return QRectF(0,0, _width, _height);
 }
 
-void QGVSubGraph::paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
+void QGVSubGraph::paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *)
 {
     painter->save();