Fix the following coccicheck warning:

drivers/regulator/db8500-prcmu.c:184:1-17: WARNING: Assignment of 0/1 to
bool variable
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200506061726.19289-1-yanaijie@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>