[media] saa7134: Fix unlocked snd_pcm_stop() call

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

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

drivers/media/pci/saa7134/saa7134-alsa.c

···
 		dprintk("irq: overrun [full=%d/%d] - Blocks in %d\n",dev->dmasound.read_count,
 			dev->dmasound.bufsize, dev->dmasound.blocks);
 		spin_unlock(&dev->slock);
+		snd_pcm_stream_lock(dev->dmasound.substream);
 		snd_pcm_stop(dev->dmasound.substream,SNDRV_PCM_STATE_XRUN);
+		snd_pcm_stream_unlock(dev->dmasound.substream);
 		return;
 	}