audio_set_port
static int audio_set_port(struct audio_softc *, mixer_ctrl_t *);
error = audio_set_port(sc, (mixer_ctrl_t *)addr);
if (audio_set_port(sc, ct) == 0)
return audio_set_port(sc, ct);
error = audio_set_port(sc, &ct);
error = audio_set_port(sc, &ct);
return audio_set_port(sc, &ct);
(void)audio_set_port(sc, mc);