sndbuf_setspd
void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd);
sndbuf_setspd(b, c->speed);
sndbuf_setspd(bs, c->speed);
sndbuf_setspd(c->bufhard, CHANNEL_SETSPEED(c->methods, c->devinfo,
sndbuf_setspd(c->bufsoft, c->speed);
sndbuf_setspd(c->bufhard, c->parentchannel->speed);