[Bug 192250] module(9) and its corresponding manpages don't document that evhand (the load/unload/etc handler) can be NULL

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 30 Sep 2021 05:21:32 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192250

Oleksandr Tymoshenko <gonzo@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|doc@FreeBSD.org             |bugs@FreeBSD.org
                 CC|                            |doc@FreeBSD.org
          Component|Documentation               |Manual Pages

Felix Johnson <felix.the.red@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |felix.the.red@gmail.com
 Attachment #228271|                            |maintainer-approval?(felix.
              Flags|                            |the.red@gmail.com)

--- Comment #1 from Felix Johnson <felix.the.red@gmail.com> ---
Created attachment 228271
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228271&action=edit
module.9 patch

Mention what happens when the event handler function is NULL.

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