net: ethernet: ti: am65-cpsw: Convert to devm_of_phy_optional_get()

Use the new devm_of_phy_optional_get() helper instead of open-coding the
same operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/01605ea233ff7fc09bb0ea34fc8126af73db83f9.1678280599.git.geert+renesas@glider.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -1470,11 +1470,9 @@ static int am65_cpsw_init_serdes_phy(struct device *dev, struct device_node *por
 	struct phy *phy;
 	int ret;
 
-	phy = devm_of_phy_get(dev, port_np, name);
-	if (PTR_ERR(phy) == -ENODEV)
-		return 0;
-	if (IS_ERR(phy))
-		return PTR_ERR(phy);
+	phy = devm_of_phy_optional_get(dev, port_np, name);
+	if (IS_ERR_OR_NULL(phy))
+		return PTR_ERR_OR_ZERO(phy);
 
 	/* Serdes PHY exists. Store it. */
 	port->slave.serdes_phy = phy;