upstream: unrevert this:

upstream: unrevert this:

> revision 1.217
> date: 2019/11/27 03:34:04;  author: dtucker;  state: Exp;  lines: +5 -7;  commitid: wkiMn49XJyjzoJIs;
> Make channel_id u_int32_t and remove unnecessary check and cast that were
> left over from the type conversion.  Noted by t-hashida@amiya.co.jp in
> bz#3098, ok markus@ djm@

Darren was right the first time; ok dtucker@ "agreed" markus@

OpenBSD-Commit-ID: 641dd1b99a6bbd85b7160da462ae1be83432c7c8