Automated report: NetBSD-current/i386 build failure

[NetBSD Test Fixture <bracket%NetBSD.org@localhost>]

This is an automatically generated notice of a NetBSD-current/i386
build failure.

The failure occurred on babylon5.netbsd.org, a NetBSD/amd64 host,
using sources from CVS date 2021.12.17.13.14.54.

An extract from the build.sh output follows:

    --- dependall-arch ---
    --- dependall-bootxx_lfsv1 ---
    --- /tmp/build/2021.12.17.13.14.54-i386/obj/sys/arch/i386/stand/bootxx/bootxx_lfsv1/lib/kern/libkern.a ---
    /tmp/build/2021.12.17.13.14.54-i386/tools/bin/nbctfconvert -g -L VERSION -o addvdi3.o addvdi3.o.o && rm -f addvdi3.o.o
    --- dependall-usr.bin ---
    /tmp/build/2021.12.17.13.14.54-i386/src/usr.bin/mail/thread.c:598:3: error: 'return' with no value, in function returning non-void [-Werror=return-type]
      598 |   return;
          |   ^~~~~~
    /tmp/build/2021.12.17.13.14.54-i386/src/usr.bin/mail/thread.c:591:1: note: declared here
      591 | first_visible_message(struct message *mp)
          | ^~~~~~~~~~~~~~~~~~~~~

The following commits were made between the last successful build and
the failed build:

    2021.12.17.13.14.54 christos src/usr.bin/mail/thread.c,v 1.13

Logs can be found at:

    http://releng.NetBSD.org/b5reports/i386/commits-2021.12.html#2021.12.17.13.14.54