net: lan966x: Do not check 0 for platform_get_irq_byname()

Since platform_get_irq_byname() never returned zero, so it need not to
check whether it returned zero, it returned -EINVAL or -ENXIO when
failed, so we replace the return error code with the result it returned.

Signed-off-by: Zhu Wang <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Horatiu Vultur <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/microchip/lan966x/lan966x_main.c

···
 
 	/* set irq */
 	lan966x->xtr_irq = platform_get_irq_byname(pdev, "xtr");
-	if (lan966x->xtr_irq <= 0)
-		return -EINVAL;
+	if (lan966x->xtr_irq < 0)
+		return lan966x->xtr_irq;
 
 	err = devm_request_threaded_irq(&pdev->dev, lan966x->xtr_irq, NULL,
 					lan966x_xtr_irq_handler, IRQF_ONESHOT,