staging: most: sound: call snd_card_new with struct device

This patch is needed as function snd_card_new needs a valid
parent device. Passing a NULL pointer leads to kernel Ooops.
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/core.h

@@ -230,6 +230,7 @@ struct mbo {
  */
 struct most_interface {
 	struct device dev;
+	struct device *driver_dev;
 	struct module *mod;
 	enum most_interface_type interface;
 	const char *description;

drivers/staging/most/sound/sound.c

@@ -590,7 +590,7 @@ static int audio_probe_channel(struct most_interface *iface, int channel_id,
 	if (ret < 0)
 		return ret;
 
-	ret = snd_card_new(NULL, -1, card_name, THIS_MODULE,
+	ret = snd_card_new(&iface->dev, -1, card_name, THIS_MODULE,
 			   sizeof(*channel), &card);
 	if (ret < 0)
 		return ret;

drivers/staging/most/usb/usb.c

@@ -1043,6 +1043,7 @@ hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
 	mdev->link_stat_timer.expires = jiffies + (2 * HZ);
 
 	mdev->iface.mod = hdm_usb_fops.owner;
+	mdev->iface.driver_dev = &interface->dev;
 	mdev->iface.interface = ITYPE_USB;
 	mdev->iface.configure = hdm_configure_channel;
 	mdev->iface.request_netinfo = hdm_request_netinfo;