Have ElementTraversal / NodeTraversal's next() methods take a reference

Source/core/html/forms/RadioInputType.cpp

Index: Source/core/html/forms/RadioInputType.cpp
diff --git a/Source/core/html/forms/RadioInputType.cpp b/Source/core/html/forms/RadioInputType.cpp
index cf5b337831c0becea886ff5e53c53e329bc360ed..70b9d0ce5f9584058217966232a6d2fb607df8ef 100644
--- a/Source/core/html/forms/RadioInputType.cpp
+++ b/Source/core/html/forms/RadioInputType.cpp
@@ -84,7 +84,7 @@ void RadioInputType::handleKeydownEvent(KeyboardEvent* event)
     // We can only stay within the form's children if the form hasn't been demoted to a leaf because
     // of malformed HTML.
     Node* node = &element();
-    while ((node = (forward ? NodeTraversal::next(node) : NodeTraversal::previous(node)))) {
+    while ((node = (forward ? NodeTraversal::next(*node) : NodeTraversal::previous(node)))) {
         // Once we encounter a form element, we know we're through.
         if (node->hasTagName(formTag))
             break;