ASoC: soc-pcm: ignore un-needed mutex_unlock() case on soc_pcm_open()

commit 140a4532 ("ASoC: soc-pcm: add soc_pcm_clean() and call it
from soc_pcm_open/close()") switch to call soc_pcm_clean() on
soc_pcm_open() when rollback case.

But, it uses "goto err" (A) *before* mutex_lock() (B) when error of
snd_soc_pcm_component_pm_runtime_get().
The mutex_unlock() (C) is not needed in such case. This patch fix it.

	static int soc_pcm_open(...)
	{
		...
		ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
		if (ret < 0)
(A)			goto err;

(B)		mutex_lock_nested(...);
		...
	err:
(C)		mutex_unlock(..);
		...
	}
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k0waag44.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -706,7 +706,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 
 	ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 	if (ret < 0)
-		goto err;
+		goto pm_err;
 
 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 
@@ -786,7 +786,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 	snd_soc_runtime_activate(rtd, substream->stream);
 err:
 	mutex_unlock(&rtd->card->pcm_mutex);
-
+pm_err:
 	if (ret < 0)
 		soc_pcm_clean(substream, 1);