ASoC: audio-graph-card: tidyup return method from probe()

Current return method from probe() is very confusable.
This patch tidyup it to normal return method
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/audio-graph-card.c

@@ -271,8 +271,10 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	snd_soc_card_set_drvdata(card, priv);
 
 	ret = devm_snd_soc_register_card(dev, card);
-	if (ret >= 0)
-		return ret;
+	if (ret < 0)
+		goto err;
+
+	return 0;
 err:
 	asoc_simple_card_clean_reference(card);