Have NodeTraversal::previous*() 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 19db7c6257dd4546fbc689617c928c1f842cb840..8bc44aa52a8a0956e0ddb51f4a1c13ad3eb10dd5 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;