ALSA: gus: Convert to the new PCM ops
Replace the copy and the silence ops with the new PCM ops. For simplifying the code a bit, two local helpers are introduced here: get_bpos() and playback_copy_ack(). Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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