Remove trailing whitespace.

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

library/HTMLPurifier/AttrDef/URI/IPv4.php

@@ -6,25 +6,25 @@
  */
 class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
 {
-    
+
     /**
      * IPv4 regex, protected so that IPv6 can reuse it
      */
     protected $ip4;
-    
+
     public function validate($aIP, $config, $context) {
-        
+
         if (!$this->ip4) $this->_loadRegex();
-        
+
         if (preg_match('#^' . $this->ip4 . '$#s', $aIP))
         {
                 return $aIP;
         }
-        
+
         return false;
-        
+
     }
-    
+
     /**
      * Lazy load function to prevent regex from being stuffed in
      * cache.
@@ -33,6 +33,6 @@ class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
         $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
         $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
     }
-    
+
 }