iio: accel: dmard09: fixed code styling issues

Cleaning up code. Found with checkpatch.

Signed-off-by: Paul Lemmermann <thepaulodoom@thepaulodoom.com>
Link: https://lore.kernel.org/r/YkItIE5sp3P4sZdY@hp-amd-paul


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>