staging:iio:gyro:adis16080: remove sparse warnings

Removed the following sparse warning:

In function 'adis16080_read_raw':
warning: 'ut' may be used uninitialized in this function

Signed-off-by: Leed Aguilar <leed.aguilar@ti.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>