Re-apply r99054 by des in 2002. This was accidentally dropped
by the update to OpenSSH 6.5p1 (r261320).
This change is actually taken from r387082 of
ports/security/openssh-portable/files/patch-ssh.c
PR: 198043
Reviewed by: des
Approved by: kib (mentor)
Sponsored by: Dell Inc.
MFC after: 3 days