MICROBOOK_BUF_SIZE
u8 *buf = kzalloc(MICROBOOK_BUF_SIZE, GFP_KERNEL);
err = snd_usb_motu_microbookii_communicate(dev, buf, MICROBOOK_BUF_SIZE,
memset(buf, 0, MICROBOOK_BUF_SIZE);
dev, buf, MICROBOOK_BUF_SIZE, &actual_length);