gpio: pch: use devres for irq generic chip

Use resource managed variants of irq_alloc_generic_chip() and
irq_setup_generic_chip().

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

drivers/gpio/gpio-pch.c

···
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
+	int rv;
 
-	gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
-				    handle_simple_irq);
+	gc = devm_irq_alloc_generic_chip(chip->dev, "pch_gpio", 1, irq_start,
+					 chip->base, handle_simple_irq);
 	if (!gc)
 		return -ENOMEM;
 
···
 	ct->chip.irq_unmask = pch_irq_unmask;
 	ct->chip.irq_set_type = pch_irq_type;
 
-	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
-			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+	rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
+					 IRQ_GC_INIT_MASK_CACHE,
+					 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
 
-	return 0;
+	return rv;
 }
 
 static int pch_gpio_probe(struct pci_dev *pdev,