ASoC: soc-core: use device_unregister() if rtd allocation failed

Because soc_free_pcm_runtime(rtd) checks rtd pointer and freeing
rtd->xxx, it doesn't work correctly in case of rtd allocation failed.

We need to use device_unregister(dev) in such case.
This patch fixup it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87r1jxxldd.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -470,8 +470,10 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
 						 dai_link->num_codecs +
 						 dai_link->num_platforms),
 			   GFP_KERNEL);
-	if (!rtd)
-		goto free_rtd;
+	if (!rtd) {
+		device_unregister(dev);
+		return NULL;
+	}
 
 	rtd->dev = dev;
 	INIT_LIST_HEAD(&rtd->list);