unwind_once
int unwind_once(struct unwind_frame_info *info);
if (unwind_once(&info) < 0 || info.ip == 0)
if (unwind_once(&info) < 0)
if (unwind_once(&info) < 0 || info.ip == 0)
if (unwind_once(info) < 0 || info->ip == 0)
ret = unwind_once(info);
if (unwind_once(&info) < 0 || info.ip == 0)