/* call-seq:
 *  close_audio()
 *
 *  **NOTE:** This method is DEPRECATED and will be removed in
 *  Rubygame 3.0. Please use the Rubygame.close_audio instead.
 *
 *  Close the audio device being used by the mixer. You should not use any
 *  mixer functions after this function, unless you use #open_audio() to
 *  re-open the audio device. See also #open_audio().
 *
 *  Returns nil.
 */
VALUE rbgm_mixer_closeaudio(VALUE module)
{
  /* This feature will be removed in Rubygame 3.0. */
  rg_deprecated("Rubygame::Mixer", "3.0");

  Mix_CloseAudio();
  return Qnil;
}