iio: imu: bmi323: Use cleanup handling for iio_device_claim_direct_mode()

Similar to existing use of guard() in this driver,
iio_device_claim_direct_scoped() will ensure that scope based cleanup
occurs.

Reviewed-by: Nuno Sa <nuno.a@analog.com>
Link: https://lore.kernel.org/r/20240128150537.44592-5-jic23@kernel.org


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