deallocate_file_lock
deallocate_file_lock(ifl);
deallocate_file_lock(releasedfl);
deallocate_file_lock(selffl);
void deallocate_file_lock(struct file_lock *fl);
deallocate_file_lock(newfl);
deallocate_file_lock(*left_lock);
deallocate_file_lock(*left_lock);
deallocate_file_lock(*right_lock);