企业微信-移除可省略的错误判断 (#734)

Co-authored-by: markwang <www.wang61@qq.com>

work/checkin/checkin.go

@@ -62,8 +62,6 @@ func (r *Client) GetCheckinData(req *GetCheckinDataRequest) (*GetCheckinDataResp
 		return nil, err
 	}
 	result := &GetCheckinDataResponse{}
-	if err = util.DecodeWithError(response, result, "GetCheckinData"); err != nil {
-		return nil, err
-	}
-	return result, nil
+	err = util.DecodeWithError(response, result, "GetCheckinData")
+	return result, err
 }