qos_1 subscribe will cause crash about emqx HOT 1 CLOSED

fixed, caused by 'mqttc' client, qos protect:

validate_frame(?SUBSCRIBE, #mqtt_frame{variable = #mqtt_frame_subscribe{topic_t

•   ErrTopics = [Topic || #mqtt_topic{name=Topic} <- Topics,
  

•                                           not emqtt_topic:validate({subscr
  

•   ErrTopics = [Topic || #mqtt_topic{name=Topic, qos=Qos} <- Topics,
  

•                                           not (emqtt_topic:validate({subsc
  case ErrTopics of
  [] -> ok;
  _ -> ?ERROR("error topics: ~p", [ErrTopics]), {error, badtopic}
  

  :

from emqx.