ASoC: s6000: Fix unlocked snd_pcm_stop() call

snd_pcm_stop() must be called in the PCM substream lock context.

Cc: <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/soc/s6000/s6000-pcm.c

···
 		    substream->runtime &&
 		    snd_pcm_running(substream)) {
 			dev_dbg(pcm->dev, "xrun\n");
+			snd_pcm_stream_lock(substream);
 			snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+			snd_pcm_stream_unlock(substream);
 			ret = IRQ_HANDLED;
 		}