net: marvell: mvmdio: use clk_get_optional

The code seems to be handling EPROBE_DEFER explicitly and if there's no
error, enables the clock. clk_get_optional exists for that.

Signed-off-by: Rosen Penev <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/marvell/mvmdio.c

···
 		if (type == BUS_TYPE_XSMI)
 			orion_mdio_xsmi_set_mdc_freq(bus);
 	} else {
-		dev->clk[0] = clk_get(&pdev->dev, NULL);
-		if (PTR_ERR(dev->clk[0]) == -EPROBE_DEFER) {
-			ret = -EPROBE_DEFER;
+		dev->clk[0] = clk_get_optional(&pdev->dev, NULL);
+		if (IS_ERR(dev->clk[0])) {
+			ret = PTR_ERR(dev->clk[0]);
 			goto out_clk;
 		}
-		if (!IS_ERR(dev->clk[0]))
-			clk_prepare_enable(dev->clk[0]);
+		clk_prepare_enable(dev->clk[0]);
 	}
 
 
···
 	mdiobus_unregister(bus);
 
 	for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
-		if (IS_ERR(dev->clk[i]))
-			break;
 		clk_disable_unprepare(dev->clk[i]);
 		clk_put(dev->clk[i]);
 	}