ASoC: soc-topology: cleanup cppcheck warning at snd_soc_find_dai_link()

This patch cleanups below cppcheck warning.

sound/soc/soc-topology.c:2129:27: style: The scope of the variable 'link' can be reduced. [variableScope]
 struct snd_soc_dai_link *link;
                          ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87mtq0wfkn.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-topology.c

@@ -2124,10 +2124,9 @@ static struct snd_soc_dai_link *snd_soc_find_dai_link(struct snd_soc_card *card,
 						      const char *stream_name)
 {
 	struct snd_soc_pcm_runtime *rtd;
-	struct snd_soc_dai_link *link;
 
 	for_each_card_rtds(card, rtd) {
-		link = rtd->dai_link;
+		struct snd_soc_dai_link *link = rtd->dai_link;
 
 		if (link->id != id)
 			continue;