Add condition before create once event listener

[Guest Ino]

Hi, if i'll call method getPersonas few times, and don't received response from steam - this events will stuck, with error.

Quote

"Possible EventEmitter memory leak detected. 11 user#steamid64 listeners added to [SteamUser]. Use emitter.setMaxListeners() to increase limit" . 

For example - you can reproduce this error when disable ethernet, and call this method 15 times.
When i added condition it works without error

ids.forEach((id) => {
  if( !this._events[`user#${id}`] ) {
    this.once('user#' + id, receive);
  }
});

I suggest add this condition to all once events created, because steam may not response and events listeners may stuck 

[Dr. McKay]

Created an issue for this: https://github.com/DoctorMcKay/node-steam-user/issues/297

[Guest Ino]

4 hours ago, Dr. McKay said:

Created an issue for this: https://github.com/DoctorMcKay/node-steam-user/issues/297

Thank you, can i help you for fastest close this issue ?