ASoC: soc-dapm: cleanup cppcheck warning at snd_soc_dapm_new_controls()

This patch cleanups below cppcheck warning.

sound/soc/soc-dapm.c:3786:30: style: The scope of the variable 'w' can be reduced. [variableScope]
 struct snd_soc_dapm_widget *w;
                             ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k0l0u242.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -3784,13 +3784,12 @@ int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
 	const struct snd_soc_dapm_widget *widget,
 	int num)
 {
-	struct snd_soc_dapm_widget *w;
 	int i;
 	int ret = 0;
 
 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
 	for (i = 0; i < num; i++) {
-		w = snd_soc_dapm_new_control_unlocked(dapm, widget);
+		struct snd_soc_dapm_widget *w = snd_soc_dapm_new_control_unlocked(dapm, widget);
 		if (IS_ERR(w)) {
 			ret = PTR_ERR(w);
 			break;