pinctrl: wpcm450: Correct the fwnode_irq_get() return value check

fwnode_irq_get() can return zero to indicate IRQ mapping errors.
Handle this case by skipping the interrupt resource.

Fixes: a1d1e0e ("pinctrl: nuvoton: Add driver for WPCM450")
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Jonathan Neuschäfer <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: andy-shev

drivers/pinctrl/nuvoton/pinctrl-wpcm450.c

@@ -1081,10 +1081,13 @@ static int wpcm450_gpio_register(struct platform_device *pdev,
 
 		girq->num_parents = 0;
 		for (i = 0; i < WPCM450_NUM_GPIO_IRQS; i++) {
-			int irq = fwnode_irq_get(child, i);
+			int irq;
 
+			irq = fwnode_irq_get(child, i);
 			if (irq < 0)
 				break;
+			if (!irq)
+				continue;
 
 			girq->parents[i] = irq;
 			girq->num_parents++;