pinctrl: baytrail: Use platform_get_irq_optional() explicitly

There is no need to repeat functionality of platform_get_irq_optional()
in the driver. Replace it with explicit call to the helper.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pinctrl/intel/pinctrl-baytrail.c

@@ -1506,8 +1506,7 @@ static int byt_gpio_probe(struct intel_pinctrl *vg)
 {
 	struct platform_device *pdev = to_platform_device(vg->dev);
 	struct gpio_chip *gc;
-	struct resource *irq_rc;
-	int ret;
+	int irq, ret;
 
 	/* Set up gpio chip */
 	vg->chip	= byt_gpio_chip;
@@ -1527,8 +1526,8 @@ static int byt_gpio_probe(struct intel_pinctrl *vg)
 #endif
 
 	/* set up interrupts  */
-	irq_rc = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (irq_rc && irq_rc->start) {
+	irq = platform_get_irq_optional(pdev, 0);
+	if (irq > 0) {
 		struct gpio_irq_chip *girq;
 
 		vg->irqchip.name = "BYT-GPIO",
@@ -1548,7 +1547,7 @@ static int byt_gpio_probe(struct intel_pinctrl *vg)
 					     sizeof(*girq->parents), GFP_KERNEL);
 		if (!girq->parents)
 			return -ENOMEM;
-		girq->parents[0] = (unsigned int)irq_rc->start;
+		girq->parents[0] = irq;
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_bad_irq;
 	}