ALSA: usb-audio: Allow changing from a bad sample rate

	bool writeable;

	u32 bmControls;

	/* First, try to find a valid clock. This may trigger

	 * automatic clock selection if the current clock is not

	 * valid.

	 */

	clock = snd_usb_clock_find_source(chip, fmt->protocol,

					  fmt->clock, true);

	if (clock < 0) {

		/* We did not find a valid clock, but that might be

		 * because the current sample rate does not match an

		 * external clock source. Try again without validation

		 * and we will do another validation after setting the

		 * rate.

		 */

		clock = snd_usb_clock_find_source(chip, fmt->protocol,

						  fmt->clock, false);

		if (clock < 0)

			return clock;

	}

	prev_rate = get_sample_rate_v2v3(chip, iface, fmt->altsetting, clock);

	if (prev_rate == rate)

		return 0;

		goto validation;

	if (fmt->protocol == UAC_VERSION_3) {

		struct uac3_clock_source_descriptor *cs_desc;

		snd_usb_set_interface_quirk(dev);

	}

validation:

	/* validate clock after rate change */

	if (!uac_clock_source_is_valid(chip, fmt->protocol, clock))

		return -ENXIO;

	return 0;

}