修复限购商品进入结算页中选择地址再返回到结算页时逻辑错误的bug

Code Review By Rock Zhang

@@ -304,9 +304,6 @@ class IndexController extends AbstractAction
         $sku = $this->get('sku', '');
         $skn = $this->get('skn', '');
         $buyNumber = $this->get('buy_number', 1);
-        if ($limitProductCode) {
-            $returnUrl = $this->server('HTTP_REFERER', $returnUrl);
-        }
 
         // 购物车商品为空跳转到购物车页面
         $uid = $this->getUid(true);
@@ -322,6 +319,11 @@ class IndexController extends AbstractAction
             return;
         }
 
+        // 限购商品时更换返回按钮地址
+        if (isset($order['isLimit'])) {
+            $returnUrl = $this->server('HTTP_REFERER', $returnUrl);
+        }
+
         $data = array(
             'orderEnsurePage' => true,
             'isOrdinaryCart' => ($cartType !== 'advance'),