ASoC: loongson: remove redundant variable assignments

In the function loongson_asoc_card_probe, it is simpler
to return the value of function devm_snd_soc_register_card
directly.
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://patch.msgid.link/20240906100523.2142-1-tangbin@cmss.chinamobile.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/loongson/loongson_card.c

@@ -192,9 +192,7 @@ static int loongson_asoc_card_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	ret = devm_snd_soc_register_card(&pdev->dev, card);
-
-	return ret;
+	return devm_snd_soc_register_card(&pdev->dev, card);
 }
 
 static const struct of_device_id loongson_asoc_dt_ids[] = {