ASoC: soc-generic-dmaengine-pcm: cleanup cppcheck warning at dmaengine_pcm_hw_params()

This patch cleanups below cppcheck warning.

sound/soc/soc-generic-dmaengine-pcm.c:82:6: style: The scope of the variable 'ret' can be reduced. [variableScope]
 int ret;
     ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/8735ra0yzz.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-generic-dmaengine-pcm.c

@@ -79,7 +79,6 @@ static int dmaengine_pcm_hw_params(struct snd_soc_component *component,
 			struct snd_pcm_hw_params *params,
 			struct dma_slave_config *slave_config);
 	struct dma_slave_config slave_config;
-	int ret;
 
 	memset(&slave_config, 0, sizeof(slave_config));
 
@@ -89,7 +88,7 @@ static int dmaengine_pcm_hw_params(struct snd_soc_component *component,
 		prepare_slave_config = pcm->config->prepare_slave_config;
 
 	if (prepare_slave_config) {
-		ret = prepare_slave_config(substream, params, &slave_config);
+		int ret = prepare_slave_config(substream, params, &slave_config);
 		if (ret)
 			return ret;