Fixed double-space typo.
diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php
index 016102a..543d1d5 100644
--- a/system/libraries/User_agent.php
+++ b/system/libraries/User_agent.php
@@ -1,4 +1,4 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *