i2c: qup: remove unneeded conversion to bool

The '>' expression itself is bool, no need to convert it to bool again.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>