ASoC: uniphier: Simplify the return expression of uniphier_aio_startup

Simplify the return expression in the aio-cpu.c.
Signed-off-by: dingsenjie <dingsenjie@yulong.com>
Link: https://lore.kernel.org/r/20210224085407.22120-1-dingsenjie@163.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/uniphier/aio-cpu.c

@@ -256,17 +256,12 @@ static int uniphier_aio_startup(struct snd_pcm_substream *substream,
 {
 	struct uniphier_aio *aio = uniphier_priv(dai);
 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
-	int ret;
 
 	sub->substream = substream;
 	sub->pass_through = 0;
 	sub->use_mmap = true;
 
-	ret = aio_init(sub);
-	if (ret)
-		return ret;
-
-	return 0;
+	return aio_init(sub);
 }
 
 static void uniphier_aio_shutdown(struct snd_pcm_substream *substream,