Followup c6460a3, avoid rendering issues

Author: nyalldawson

src/core/symbology-ng/qgslinesymbollayerv2.cpp

@@ -302,6 +302,7 @@ void QgsSimpleLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSym
   applyDataDefinedSymbology( context, mPen, mSelPen, offset );
 
   p->setPen( context.selected() ? mSelPen : mPen );
+  p->setBrush( Qt::NoBrush );
 
   // Disable 'Antialiasing' if the geometry was generalized in the current RenderContext (We known that it must have least #2 points).
   if ( points.size() <= 2 &&