net: dsa: realtek: make use of dev_err_cast_probe()

Using dev_err_cast_probe() to simplify the code.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Link: https://patch.msgid.link/20240828121805.3696631-1-lihongbo22@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/realtek/rtl83xx.c

@@ -185,11 +185,9 @@ rtl83xx_probe(struct device *dev,
 
 	/* TODO: if power is software controlled, set up any regulators here */
 	priv->reset_ctl = devm_reset_control_get_optional(dev, NULL);
-	if (IS_ERR(priv->reset_ctl)) {
-		ret = PTR_ERR(priv->reset_ctl);
-		dev_err_probe(dev, ret, "failed to get reset control\n");
-		return ERR_CAST(priv->reset_ctl);
-	}
+	if (IS_ERR(priv->reset_ctl))
+		return dev_err_cast_probe(dev, priv->reset_ctl,
+					  "failed to get reset control\n");
 
 	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(priv->reset)) {