media: au0828: use signals instead of hardcoding a pad number

When creating the audio link, use pad signals, instead of
hardcoding using the pad index number.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/au0828/au0828-core.c

@@ -266,11 +266,13 @@ static void au0828_media_graph_notify(struct media_entity *new,
 
 create_link:
 	if (decoder && mixer) {
-		ret = media_create_pad_link(decoder,
-					    DEMOD_PAD_AUDIO_OUT,
+		ret = media_get_pad_index(decoder, false,
+					  PAD_SIGNAL_AUDIO);
+		if (ret >= 0)
+			ret = media_create_pad_link(decoder, ret,
 						    mixer, 0,
 						    MEDIA_LNK_FL_ENABLED);
-		if (ret)
+		if (ret < 0)
 			dev_err(&dev->usbdev->dev,
 				"Mixer Pad Link Create Error: %d\n", ret);
 	}