Remove trailing whitespace.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

library/HTMLPurifier/DefinitionCache/Null.php

@@ -5,34 +5,34 @@
  */
 class HTMLPurifier_DefinitionCache_Null extends HTMLPurifier_DefinitionCache
 {
-    
+
     public function add($def, $config) {
         return false;
     }
-    
+
     public function set($def, $config) {
         return false;
     }
-    
+
     public function replace($def, $config) {
         return false;
     }
-    
+
     public function remove($config) {
         return false;
     }
-    
+
     public function get($config) {
         return false;
     }
-    
+
     public function flush($config) {
         return false;
     }
-    
+
     public function cleanup($config) {
         return false;
     }
-    
+
 }