Staging: iio: adis16209: Adjust a switch statement

Adjust a switch block to explicitly match channels and
return -EINVAL as default case which makes the code
semantically more clear.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
1 file changed