CVE-2022-32742: s3: smbd: Harden the smbreq_bufrem() macro.
Fixes the raw.write.bad-write test.
NB. We need the two (==0) changes in source3/smbd/smb2_reply.c
as the gcc optimizer now knows that the return from
smbreq_bufrem() can never be less than zero.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15085
Remove knownfail.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): Jule Anger <janger@samba.org>
Autobuild-Date(master): Wed Jul 27 11:46:46 UTC 2022 on sn-devel-184