irqchip/imx-mu-msi: Do not check for 0 return after calling platform_get_irq()

It is not possible for platform_get_irq() to return 0. Use the
return value from platform_get_irq().

Signed-off-by: Ruan Jinjie <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ruan Jinjie

drivers/irqchip/irq-imx-mu-msi.c

@@ -339,8 +339,8 @@ static int __init imx_mu_of_init(struct device_node *dn,
 	msi_data->msiir_addr = res->start + msi_data->cfg->xTR;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return -ENODEV;
+	if (irq < 0)
+		return irq;
 
 	platform_set_drvdata(pdev, msi_data);