SMB_LOCK_RELEASE
mb_put_uint16le(mbp, op == SMB_LOCK_RELEASE ? 1 : 0);
mb_put_uint16le(mbp, op == SMB_LOCK_RELEASE ? 0 : 1);
lkop = SMB_LOCK_RELEASE;
error = smbfs_smb_lock(np, SMB_LOCK_RELEASE, id, start, end, scred);