ASoC: wcd934x: remove unnecessary comparisons to bool

Fix the following coccicheck warning:

sound/soc/codecs/wcd934x.c:3881:8-17: WARNING: Comparison of 0/1 to bool
variable

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200420042833.19116-1-yanaijie@huawei.com


Signed-off-by: Mark Brown <broonie@kernel.org>