Bug 632206: remove unneeded rooting, r=lw

js/src/jit-test/tests/basic/bug632206.js

@@ -0,0 +1,6 @@
+// don't crash
+x = <x/>
+for (a = 0; a < 9; a++) {
+  x.elements()
+}
+

js/src/jsxml.cpp

@@ -5657,7 +5657,6 @@ xml_elements(JSContext *cx, uintN argc, jsval *vp)
     nameqn = ToXMLName(cx, name, &funid);
     if (!nameqn)
         return JS_FALSE;
-    vp[2] = OBJECT_TO_JSVAL(nameqn);
 
     if (!JSID_IS_VOID(funid))
         return xml_list_helper(cx, xml, vp) != NULL;