code review by fei.hong: fixes bug to www redirect url

@@ -76,7 +76,7 @@ class Mobile
             $uri = '/girls';
         }
         if ($host === 'www.yohobuy.com') {
-            $url = 'm.yohobuy.com' . $uri;
+            return 'm.yohobuy.com' . $uri;
         }
         
         $url = strtr($host, array('.yohobuy.com' => '.m.yohobuy.com')) . $uri;