staging:iio: prevent divide by zero bugs

"val" is used as a divisor later, so we should check for zero here to
avoid a division by zero.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
6 files changed