Make sure to drop the reference to the parent device taken by
class_find_device() after "unexporting" any children when deregistering
a PWM chip.

Fixes: 0733424c ("pwm: Unexport children before chip removal")
Signed-off-by: NJohan Hovold <johan@kernel.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>