[HttpKernel] Fix variable conflicting name

Author: tgalopin

Kernel.php

@@ -473,8 +473,8 @@ protected function initializeBundles()
                 $hierarchy[] = $name;
             }
 
-            foreach ($hierarchy as $bundle) {
-                $this->bundleMap[$bundle] = $bundleMap;
+            foreach ($hierarchy as $hierarchyBundle) {
+                $this->bundleMap[$hierarchyBundle] = $bundleMap;
                 array_pop($bundleMap);
             }
         }