ASoC: soc-pcm: cleanup soc_pcm_apply_msb()

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

	struct snd_soc_dai *codec_dai;

	struct snd_soc_pcm_stream *pcm_codec, *pcm_cpu;

	int stream = substream->stream;

	int i;

	unsigned int bits = 0, cpu_bits;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {

		for_each_rtd_codec_dai(rtd, i, codec_dai) {

			if (codec_dai->driver->playback.sig_bits == 0) {

				bits = 0;

				break;

			}

			bits = max(codec_dai->driver->playback.sig_bits, bits);

		}

		cpu_bits = cpu_dai->driver->playback.sig_bits;

	} else {

	for_each_rtd_codec_dai(rtd, i, codec_dai) {

			if (codec_dai->driver->capture.sig_bits == 0) {

		pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);

		if (pcm_codec->sig_bits == 0) {

			bits = 0;

			break;

		}

			bits = max(codec_dai->driver->capture.sig_bits, bits);

		}

		cpu_bits = cpu_dai->driver->capture.sig_bits;

		bits = max(pcm_codec->sig_bits, bits);

	}

	pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);

	cpu_bits = pcm_cpu->sig_bits;

	soc_pcm_set_msb(substream, bits);

	soc_pcm_set_msb(substream, cpu_bits);

}