pinctrl: ocelot: Remove unnecessary conversion to bool

Fix the following coccicheck warning:

./drivers/pinctrl/pinctrl-ocelot.c:732:28-33: WARNING: conversion to bool not needed here

Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Link: https://lore.kernel.org/r/1604651795-1220-1-git-send-email-kaixuxia@tencent.com


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