gpio: cs5535: Simplify the return expression of cs5535_gpio_probe()

Simplify the return expression.

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201210135609.1372-1-zhengyongjun3@huawei.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>