ASoC: wm8962: Convert to devm_clk_get_optional()

Use the existing devm_clk_get_optional() helper instead of building a
similar construct on top of devm_clk_get() that fails to handle all
errors but -EPROBE_DEFER.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/c2a8a1a628804a4439732d02847e25c227083690.1634565564.git.geert+renesas@glider.beSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm8962.c

@@ -3538,9 +3538,8 @@ static int wm8962_set_pdata_from_of(struct i2c_client *i2c,
 				pdata->gpio_init[i] = 0x0;
 		}
 
-	pdata->mclk = devm_clk_get(&i2c->dev, NULL);
-
-	return 0;
+	pdata->mclk = devm_clk_get_optional(&i2c->dev, NULL);
+	return PTR_ERR_OR_ZERO(pdata->mclk);
 }
 
 static int wm8962_i2c_probe(struct i2c_client *i2c,
@@ -3572,14 +3571,6 @@ static int wm8962_i2c_probe(struct i2c_client *i2c,
 			return ret;
 	}
 
-	/* Mark the mclk pointer to NULL if no mclk assigned */
-	if (IS_ERR(wm8962->pdata.mclk)) {
-		/* But do not ignore the request for probe defer */
-		if (PTR_ERR(wm8962->pdata.mclk) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		wm8962->pdata.mclk = NULL;
-	}
-
 	for (i = 0; i < ARRAY_SIZE(wm8962->supplies); i++)
 		wm8962->supplies[i].supply = wm8962_supply_names[i];