Optimize get_instance() calls/assignments
diff --git a/system/core/Loader.php b/system/core/Loader.php
index daf326f..7817258 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -642,8 +642,7 @@
 	 */
 	public function config($file, $use_sections = FALSE, $fail_gracefully = FALSE)
 	{
-		$CI =& get_instance();
-		return $CI->config->load($file, $use_sections, $fail_gracefully);
+		return get_instance()->config->load($file, $use_sections, $fail_gracefully);
 	}
 
 	// --------------------------------------------------------------------