gpio: brcmstb: check return value of gpiochip_irqchip_add()

Because gpiochip_irqchip_add() may fail, its return value should
be checked.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-brcmstb.c

@@ -339,6 +339,7 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
 	struct brcmstb_gpio_priv *priv = bank->parent_priv;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
+	int err;
 
 	bank->irq_chip.name = dev_name(dev);
 	bank->irq_chip.irq_mask = brcmstb_gpio_irq_mask;
@@ -355,8 +356,6 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
 			dev_warn(dev,
 				"Couldn't get wake IRQ - GPIOs will not be able to wake from sleep");
 		} else {
-			int err;
-
 			/*
 			 * Set wakeup capability before requesting wakeup
 			 * interrupt, so we can process boot-time "wakeups"
@@ -383,8 +382,10 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
 	if (priv->can_wake)
 		bank->irq_chip.irq_set_wake = brcmstb_gpio_irq_set_wake;
 
-	gpiochip_irqchip_add(&bank->gc, &bank->irq_chip, 0,
-			handle_simple_irq, IRQ_TYPE_NONE);
+	err = gpiochip_irqchip_add(&bank->gc, &bank->irq_chip, 0,
+				   handle_simple_irq, IRQ_TYPE_NONE);
+	if (err)
+		return err;
 	gpiochip_set_chained_irqchip(&bank->gc, &bank->irq_chip,
 			priv->parent_irq, brcmstb_gpio_irq_handler);