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

This patch cleanups below cppcheck warning.

sound/soc/soc-pcm.c:1305:30: style: The scope of the variable 'widget' can be reduced. [variableScope]
 struct snd_soc_dapm_widget *widget;
                             ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pmv4zf2c.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -1307,13 +1307,12 @@ void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
 			      struct snd_soc_dapm_widget_list *list)
 {
-	struct snd_soc_dapm_widget *widget;
 	struct snd_soc_dai *dai;
 	unsigned int i;
 
 	/* is there a valid DAI widget for this BE */
 	for_each_rtd_dais(dpcm->be, i, dai) {
-		widget = snd_soc_dai_get_widget(dai, stream);
+		struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
 
 		/*
 		 * The BE is pruned only if none of the dai