Staging: iio: accel: adis16201: Adjust argument to match open parentheses

In adis16201_read_raw() adjust an argument to match an open parentheses
using tabs and spaces.
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>