irqchip/irq-pruss-intc: 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 <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/irqchip/irq-pruss-intc.c

···
 			continue;
 
 		irq = platform_get_irq_byname(pdev, irq_names[i]);
-		if (irq <= 0) {
-			ret = (irq == 0) ? -EINVAL : irq;
+		if (irq < 0) {
+			ret = irq;
 			goto fail_irq;
 		}