trivial change for better code understood

jsonform.gadget.js

@@ -72,11 +72,11 @@
   }
 
   function checkCircular(urls, path, url) {
-    var required_stack,
+    var stack,
       idx,
       prev_field_path = getMaxPathInDict(urls, path);
-    required_stack = urls[prev_field_path] || [];
-    idx = required_stack.indexOf(url);
+    stack = urls[prev_field_path] || [];
+    idx = stack.indexOf(url);
     if (idx >= 0) {
       if (path === prev_field_path && idx === 0) {
         return;
@@ -84,7 +84,7 @@
       return true;
     }
     // copy and add url as first element
-    urls[path] = [url].concat(required_stack);
+    urls[path] = [url].concat(stack);
   }
 
   function checkHardCircular(g, path, url) {