snd_dice_transaction_get_rate
err = snd_dice_transaction_get_rate(dice, &rate);
err = snd_dice_transaction_get_rate(dice, &curr_rate);
err = snd_dice_transaction_get_rate(dice, &rate);
err = snd_dice_transaction_get_rate(dice, &rate);
int snd_dice_transaction_get_rate(struct snd_dice *dice, unsigned int *rate);