Optimize get_instance() calls/assignments
diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index 9f953d4..6656159 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -282,8 +282,7 @@
 		extract($params);
 
 		// Load the xml helper
-		$CI =& get_instance();
-		$CI->load->helper('xml');
+		get_instance()->load->helper('xml');
 
 		// Generate the result
 		$xml = '<'.$root.'>'.$newline;