net: mscc: ocelot: fix error code in mscc_ocelot_probe()

Probe should return an error code if platform_get_irq_byname() fails
but it returns success instead.

Fixes: 6c30384e ("net: mscc: ocelot: register devlink ports")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NVladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/YBkXyFIl4V9hgxYM@mwandaSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mscc/ocelot_vsc7514.c

@@ -1300,8 +1300,10 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 		goto out_free_devlink;
 
 	irq_xtr = platform_get_irq_byname(pdev, "xtr");
-	if (irq_xtr < 0)
+	if (irq_xtr < 0) {
+		err = irq_xtr;
 		goto out_free_devlink;
+	}
 
 	err = devm_request_threaded_irq(&pdev->dev, irq_xtr, NULL,
 					ocelot_xtr_irq_handler, IRQF_ONESHOT,