snd_usb_add_endpoint
int snd_usb_add_endpoint(struct snd_usb_audio *chip, int ep_num, int type);
err = snd_usb_add_endpoint(chip, fp->endpoint,
err = snd_usb_add_endpoint(chip, fp->sync_ep,
err = snd_usb_add_endpoint(chip, fp->endpoint,
err = snd_usb_add_endpoint(chip, fp->sync_ep,