pinctrl: ocelot: simplify the return expression of ocelot_gpiochip_register()

Simplify the return expression.

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200921131057.92895-1-miaoqinglang@huawei.com


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