ASoC: da7218: Use devm_clk_get_optional()

Use devm_clk_get_optional() instead of hand writing it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/51976b2515d7007ba5c8aa7524892f147d7cdd51.1681363691.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/da7218.c

@@ -2893,14 +2893,10 @@ static int da7218_probe(struct snd_soc_component *component)
 	da7218_handle_pdata(component);
 
 	/* Check if MCLK provided, if not the clock is NULL */
-	da7218->mclk = devm_clk_get(component->dev, "mclk");
+	da7218->mclk = devm_clk_get_optional(component->dev, "mclk");
 	if (IS_ERR(da7218->mclk)) {
-		if (PTR_ERR(da7218->mclk) != -ENOENT) {
-			ret = PTR_ERR(da7218->mclk);
-			goto err_disable_reg;
-		} else {
-			da7218->mclk = NULL;
-		}
+		ret = PTR_ERR(da7218->mclk);
+		goto err_disable_reg;
 	}
 
 	/* Default PC to free-running */