free_voice
void (*free_voice)(struct snd_emux_voice *vp);
static void free_voice(struct snd_emux_voice *vp);
.free_voice = free_voice,
if (emu->ops.free_voice)
emu->ops.free_voice(vp);
if (emu->ops.free_voice)
emu->ops.free_voice(vp);
if (free && emu->ops.free_voice)
emu->ops.free_voice(vp);