[Config] Missing type argument passed to loader.

In FileLoader the $type is not passed to the child loader.

Author: beberlei

src/Symfony/Component/Config/Loader/FileLoader.php

@@ -72,7 +72,7 @@ public function import($resource, $type = null, $ignoreErrors = false, $sourceRe
  }
  self::$loading[$resource] = true;
 
- $ret = $loader->load($resource);
+ $ret = $loader->load($resource, $type);
 
  unset(self::$loading[$resource]);