Bug 569463 - Stop coverity complaining about GetParsedAttr call in RebuildPathAndVerticesFromMpathElem. r=jwatt

content/svg/content/src/SVGMotionSMILAnimationFunction.cpp

@@ -253,9 +253,9 @@ SVGMotionSMILAnimationFunction::
   // Use the path that's the target of our chosen <mpath> child.
   nsSVGPathElement* pathElem = aMpathElem->GetReferencedPath();
   if (pathElem) {
-    if (pathElem->HasAttr(kNameSpaceID_None, nsGkAtoms::d)) {
-      const nsAString& pathSpec =
-        pathElem->GetParsedAttr(nsGkAtoms::d)->GetStringValue();
+    const nsAttrValue* value = pathElem->GetParsedAttr(nsGkAtoms::d);
+    if (value) {
+      const nsAString& pathSpec = value->GetStringValue();
       nsresult rv = SetPathVerticesFromPathString(pathSpec);
       if (NS_SUCCEEDED(rv)) {
         mPath = pathElem->GetFlattenedPath(