linux-phytec-ti

staging: iio: ad9832: Remove redundant check

'val' is unsigned and cannot be negative.

Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Cc: Michael Hennerich <hennerich@blackfin.uclinux.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>