[bug report] iio: imu: inv_icm45600: add buffer support in iio devices

[Dan Carpenter <dan.carpenter@linaro.org>]

Hello Remi Buisson,

Commit 06674a72cf7a ("iio: imu: inv_icm45600: add buffer support in
iio devices") from Oct 7, 2025 (linux-next), leads to the following
Smatch static checker warning:

	drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.c:377 inv_icm45600_buffer_postdisable()
	error: uninitialized symbol 'sleep'.

drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.c
    354 static int inv_icm45600_buffer_postdisable(struct iio_dev *indio_dev)
    355 {
    356         struct inv_icm45600_state *st = iio_device_get_drvdata(indio_dev);
    357         struct device *dev = regmap_get_device(st->map);
    358         unsigned int sensor;
    359         unsigned int *watermark;
    360         unsigned int sleep;
    361         int ret;
    362 
    363         if (indio_dev == st->indio_gyro) {
    364                 sensor = INV_ICM45600_SENSOR_GYRO;
    365                 watermark = &st->fifo.watermark.gyro;
    366         } else if (indio_dev == st->indio_accel) {
    367                 sensor = INV_ICM45600_SENSOR_ACCEL;
    368                 watermark = &st->fifo.watermark.accel;
    369         } else {
    370                 return -EINVAL;
    371         }
    372 
    373         scoped_guard(mutex, &st->lock)
    374                 ret = _inv_icm45600_buffer_postdisable(st, sensor, watermark, &sleep);
    375 
    376         /* Sleep required time. */
--> 377         if (sleep)

sleep is only set if _inv_icm45600_buffer_postdisable() succeeds.

    378                 msleep(sleep);
    379 
    380         pm_runtime_put_autosuspend(dev);
    381 
    382         return ret;
    383 }

regards,
dan carpenter