ASoC: soc-pcm: fix sig_bits determination in soc_pcm_apply_msb()

In the SNDRV_PCM_STREAM_CAPTURE branch in soc_pcm_apply_msb(), look at
sig_bits of the capture stream, not the playback one.

Spotted by coverity.
Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

sound/soc/soc-pcm.c

@@ -352,7 +352,7 @@ static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 	} else {
 		for (i = 0; i < rtd->num_codecs; i++) {
 			codec_dai = rtd->codec_dais[i];
-			if (codec_dai->driver->playback.sig_bits == 0) {
+			if (codec_dai->driver->capture.sig_bits == 0) {
 				bits = 0;
 				break;
 			}