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

This patch cleanups below cppcheck warning.

sound/soc/soc-dapm.c:3190:9: style: The scope of the variable 'err' can be reduced. [variableScope]
 int i, err;
        ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87lf5gu246.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -3188,12 +3188,12 @@ static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
 			     const struct snd_soc_dapm_route *route, int num)
 {
-	int i, err;
+	int i;
 	int ret = 0;
 
 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
 	for (i = 0; i < num; i++) {
-		err = snd_soc_dapm_weak_route(dapm, route);
+		int err = snd_soc_dapm_weak_route(dapm, route);
 		if (err)
 			ret = err;
 		route++;