staging: iio: cdc: remove braces from single line if blocks

Remove braces from single line if blocks to clear checkpatch warnings.
WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Alexander Vorwerk <alec@vc-celle.de>
Link: https://lore.kernel.org/r/20210820224914.1260-1-alec@vc-celle.de


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