Remove trailing whitespace.

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

library/HTMLPurifier/Strategy/ValidateAttributes.php

@@ -6,33 +6,33 @@
 
 class HTMLPurifier_Strategy_ValidateAttributes extends HTMLPurifier_Strategy
 {
-    
+
     public function execute($tokens, $config, $context) {
-        
+
         // setup validator
         $validator = new HTMLPurifier_AttrValidator();
-        
+
         $token = false;
         $context->register('CurrentToken', $token);
-        
+
         foreach ($tokens as $key => $token) {
-            
+
             // only process tokens that have attributes,
             //   namely start and empty tags
             if (!$token instanceof HTMLPurifier_Token_Start && !$token instanceof HTMLPurifier_Token_Empty) continue;
-            
+
             // skip tokens that are armored
             if (!empty($token->armor['ValidateAttributes'])) continue;
-            
+
             // note that we have no facilities here for removing tokens
             $validator->validateToken($token, $config, $context);
-            
+
             $tokens[$key] = $token; // for PHP 4
         }
         $context->destroy('CurrentToken');
-        
+
         return $tokens;
     }
-    
+
 }