Optimize get_instance() calls/assignments
diff --git a/system/helpers/language_helper.php b/system/helpers/language_helper.php
index 4d571a7..d7aa8e6 100644
--- a/system/helpers/language_helper.php
+++ b/system/helpers/language_helper.php
@@ -52,8 +52,7 @@
 	 */
 	function lang($line, $for = '', $attributes = array())
 	{
-		$CI =& get_instance();
-		$line = $CI->lang->line($line);
+		$line = get_instance()->lang->line($line);
 
 		if ($for !== '')
 		{