staging:iio:light: Add some missing brackets to make sure code works as intended.

Note this is not a bug due to the fact the region cannot be reached without the sanity check passing. The autobuilder reported it as missaligned code which is kind of true as well.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: Roberta Dobrescu <roberta.dobrescu@gmail.com>