gpio: twl4030: use devm_irq_alloc_descs()

This driver never frees the irq descriptors it allocates. Fix it by
using a resource managed variant of irq_alloc_descs().

Signed-off-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-twl4030.c

···
 		goto no_irqs;
 	}
 
-	irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0);
+	irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
+					0, TWL4030_GPIO_MAX, 0);
 	if (irq_base < 0) {
 		dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
 		return irq_base;