sw: avoid temporary object creation to build GraphicPrimitive2D

As drawinglayer::primitive2d::GraphicPrimitive2D constructor expects a
GraphicObject ref, we can simply pass in rGrfObj instead of building a
(implicit) temp GraphicObjet using the GetGraphic() result.

Change-Id: I8c54f20804390c773fdf9406f534787ce7143e84
Reviewed-on: https://gerrit.libreoffice.org/14390Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

sw/source/core/doc/notxtfrm.cxx

@@ -808,7 +808,7 @@ void paintGraphicUsingPrimitivesHelper(OutputDevice & rOutputDevice,
     {
         aContent[0] = new drawinglayer::primitive2d::GraphicPrimitive2D(
             aTargetTransform,
-            rGrfObj.GetGraphic(),
+            rGrfObj,
             rGraphicAttr);
     }