iio: imu: adis: fix uninitialized symbol warning

Fix below kernel warning:
smatch warnings:
drivers/iio/imu/adis.c:319 __adis_check_status() error: uninitialized symbol 'status_16'.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Link: https://patch.msgid.link/20250304060518.1834910-1-sunliming@linux.dev


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>