CURRENT [r309933] broke syslogd on IPv4 only system

Hello,

Please take a look SVN r309933:
------------------------------------------------------------------------
r309933 | hrs | 2016-12-12 22:33:40 +0300 (Mon, 12 Dec 2016) | 13 lines

- Refactor listening socket list.  All of the listening sockets are
  now maintained in a single linked-list in a transport-independent manner.
- Use queue.h for linked-list structure.
- Use linked-list for AllowedPeers.
- Use getaddrinfo(8) even for Unix Domain sockets.
- Use macros to type-casting from/to struct sockaddr{,_in,_in6}.
- Define fu_* macro for union f_un to shorten the member names.
- Remove an extra #include <sys/type.h>.
- Add "static" to non-exported symbols.
- !INET support is still incomplete but will be fixed later.

There is no functional change except for some minor debug messages.
------------------------------------------------------------------------

After this change syslogd is not listen on local sockets:

# /usr/sbin/syslogd -d
Try (null)
new socket fd is 6
shutdown
sending on socket
Try /var/run/log
Try /var/run/logpriv
off & running....
init
loading timezone data via tzset()
. . .

# sockstat | grep syslogd
root     syslogd    19151 6  udp4   *:514                 *:*

# ls -l /var/run/ |grep log
-rw-------  1 root   wheel        5 Jan 28 14:30 syslog.pid

Root cause:

usr.sbin/syslogd/syslogd.c
. . .
    309 #ifdef INET6
    310 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
    311 #else
    312 static int      family = PF_INET; /* protocol family (IPv4 only) */
    313 #endif
. . .
   2856 static int
   2857 socksetup(struct peer *pe)
. . .
2911                 if (family != AF_UNSPEC && res->ai_family != family)
   2912                         continue;

in case of IPv4-only system (WITHOUT_INET6=YES in /etc/src.conf) we have family = PF_INET in 312 line and function socksetup will skip listen on local sockets.

Proposed patch:

Index: syslogd.c
===================================================================
--- syslogd.c   (revision 312909)
+++ syslogd.c   (working copy)
_at__at_ -2908,7 +2908,7 _at__at_
                        /* Only AF_LOCAL in secure mode. */
                        continue;
                }
-               if (family != AF_UNSPEC && res->ai_family != family)
+               if (res->ai_family != AF_LOCAL && res->ai_family != family)
                        continue;

                s = socket(res->ai_family, res->ai_socktype,

Successfully tested on IPv4-only CURRENT r312856M.

Thank you! 

Alex Deiter
alex.deiter_at_gmail.com