Function co_task_free

tools/audio.cpp:34–36

  template<class T>
  void co_task_free(T *p) {
    CoTaskMemFree((LPVOID) p);
  }

  using device_enum_t = util::safe_ptr<IMMDeviceEnumerator, Release<IMMDeviceEnumerator>>;
  using collection_t = util::safe_ptr<IMMDeviceCollection, Release<IMMDeviceCollection>>;