mdns init first starts timer task, then starts service task. if service task failed to be created, timer task needs to be stopped too. fixed https://ezredmine.espressif.cn:8765/issues/28466
mdns init first starts timer task, then starts service task. if service task failed to be created, timer task needs to be stopped too. fixed https://ezredmine.espressif.cn:8765/issues/28466