gpio: pch: check the return value of irq_alloc_generic_chip()

This function can fail, so check the return value before dereferencing
the returned pointer.

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

drivers/gpio/gpio-pch.c

···
 	return ret;
 }
 
-static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
-				unsigned int irq_start, unsigned int num)
+static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
+				       unsigned int irq_start,
+				       unsigned int num)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 
 	gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
 				    handle_simple_irq);
+	if (!gc)
+		return -ENOMEM;
+
 	gc->private = chip;
 	ct = gc->chip_types;
 
···
 
 	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
 			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+
+	return 0;
 }
 
 static int pch_gpio_probe(struct pci_dev *pdev,
···
 		goto err_request_irq;
 	}
 
-	pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
+	ret = pch_gpio_alloc_generic_chip(chip, irq_base,
+					  gpio_pins[chip->ioh]);
+	if (ret)
+		goto err_request_irq;
 
 end:
 	return 0;