cas(4) change

[SAITOH Masanobu <msaitoh%execsw.org@localhost>]

 Hi.

 I modified cas(4) and committed:

	http://mail-index.netbsd.org/source-changes/2019/12/26/msg112295.html

I tested only on amd64. If you got any problem with the above change,
let me know.

Thanks.

-- 
-----------------------------------------------
                SAITOH Masanobu (msaitoh%execsw.org@localhost
                                 msaitoh%netbsd.org@localhost)