[RFC PATCH v2 07/22] ASoC: Add SOC USB APIs for adding an USB backend

[Zhou Furong]

>> +void *snd_soc_usb_get_priv_data(struct device *usbdev)
>> +{
>> +	struct snd_soc_usb *ctx;
>> +
>> +	if (!usbdev)
>> +		return NULL;
> 
> How could usbdev ever be NULL?
The method is exported to public, valid check should be reasonable
as someone may call it by mistake

> 
>> +
>> +	ctx = snd_soc_find_usb_ctx(usbdev);
>> +
>> +	return ctx ? ctx->priv_data : NULL;
>> +}
>> +EXPORT_SYMBOL_GPL(snd_soc_usb_get_priv_data);
>> +