ASoC: soc-pcm: cleanup cppcheck warning at soc_pcm_apply_msb()

This patch cleanups below cppcheck warning.

sound/soc/soc-pcm.c:446:29: style: The scope of the variable 'pcm_codec' can be reduced. [variableScope]
 struct snd_soc_pcm_stream *pcm_codec, *pcm_cpu;
                            ^
sound/soc/soc-pcm.c:446:41: style: The scope of the variable 'pcm_cpu' can be reduced. [variableScope]
 struct snd_soc_pcm_stream *pcm_codec, *pcm_cpu;
                                        ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87tukgzf2p.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -449,13 +449,12 @@ static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_dai *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 = 0;
 
 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
-		pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
+		struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 
 		if (pcm_codec->sig_bits == 0) {
 			bits = 0;
@@ -465,7 +464,7 @@ static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 	}
 
 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
-		pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
+		struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 
 		if (pcm_cpu->sig_bits == 0) {
 			cpu_bits = 0;