Fix the following coccicheck warning:
./drivers/pinctrl/sprd/pinctrl-sprd.c:690:8-23: WARNING: Comparison to
bool

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: YANG LI <abaci-bugfix@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/1610440080-68600-1-git-send-email-abaci-bugfix@linux.alibaba.com


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