sanitize_state
ns = sanitize_state(device, os, ns, &ssw);
ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);
ns = sanitize_state(device, os, ns, NULL);
static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state os,
ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);
ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);