ASoC: s6000: Fix unlocked snd_pcm_stop() call

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

Cc: <stable@vger.kernel.org>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/soc/s6000/s6000-pcm.c b/sound/soc/s6000/s6000-pcm.c
index 1358c7d..d0740a7 100644
--- a/sound/soc/s6000/s6000-pcm.c
+++ b/sound/soc/s6000/s6000-pcm.c
@@ -128,7 +128,9 @@
 		    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;
 		}