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

This patch cleanups below cppcheck warning.

sound/soc/soc-dapm.c:1063:9: style: The scope of the variable 'ret' can be reduced. [variableScope]
 int i, ret;
        ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87tuk4u24x.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -1060,10 +1060,10 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 /* create new dapm volume control */
 static int dapm_new_pga(struct snd_soc_dapm_widget *w)
 {
-	int i, ret;
+	int i;
 
 	for (i = 0; i < w->num_kcontrols; i++) {
-		ret = dapm_create_or_share_kcontrol(w, i);
+		int ret = dapm_create_or_share_kcontrol(w, i);
 		if (ret < 0)
 			return ret;
 	}