fix xcxqrcode problem

go/gopath/src/fohow.com/apps/controllers/railsadmin_controller/generate_controller.go

@@ -150,7 +150,7 @@ func (self *RailsadminController) GenerateXcxQrcode() {
 		beego.AppConfig.String("AliOssBucket"), wxUser.InviteQrcodeUrl)
 
 	qrcodeUrl := ""
-	if err != nil {
+	if err == nil {
 		scene := fmt.Sprintf("invite_wx_%d", wxUser.Id)
 		qrcodeData := wx_mp.GenerateQrcode(wx_mp.QR_SCENE, homeUrl, scene, width)
 		beego.BeeLogger.Warn("invite_controller.GenerateQrcode() data_array: %d", qrcodeData)