gpio: max77620: Do not allocate IRQs upfront

regmap_add_irq_chip() will try to allocate all of the IRQ descriptors
upfront if passed a non-zero irq_base parameter. However, the intention
is to allocate IRQ descriptors on an as-needed basis if possible. Pass 0
instead of -1 to fix that use-case.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20191002122825.3948322-2-thierry.reding@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-max77620.c

@@ -304,7 +304,7 @@ static int max77620_gpio_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_regmap_add_irq_chip(&pdev->dev, chip->rmap, gpio_irq,
-				       IRQF_ONESHOT, -1,
+				       IRQF_ONESHOT, 0,
 				       &max77620_gpio_irq_chip,
 				       &chip->gpio_irq_data);
 	if (ret < 0) {