Make SVGTextPositioningElement::elementFromRenderer take a reference

Source/core/svg/SVGTextPositioningElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 72 matching lines @@
     if (!renderer)
         return;
 
     ASSERT(updateRelativeLengths || attrName == SVGNames::rotateAttr);
 
     if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(renderer))
         textRenderer->setNeedsPositioningValuesUpdate();
     markForLayoutAndParentResourceInvalidation(renderer);
 }
 
-SVGTextPositioningElement* SVGTextPositioningElement::elementFromRenderer(RenderObject* renderer)
+SVGTextPositioningElement* SVGTextPositioningElement::elementFromRenderer(RenderObject& renderer)
 {
-    if (!renderer)
+    if (!renderer.isSVGText() && !renderer.isSVGInline())
         return 0;
 
-    if (!renderer->isSVGText() && !renderer->isSVGInline())
-        return 0;
-
-    Node* node = renderer->node();
+    Node* node = renderer.node();
     ASSERT(node);
     ASSERT(node->isSVGElement());
 
     return isSVGTextPositioningElement(*node) ? toSVGTextPositioningElement(node) : 0;
 }
 
 }