[Bug 201700] netstat -s segmentation fault after pfkey section

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201700

--- Comment #3 from Jason Unovitch <jason.unovitch at gmail.com> ---
(In reply to Mark Johnston from comment #2)

Mark,
Thanks again for the quick response!  Your patch worked for me for what I
opened the PR for.

This was on the following `uname -a` with your patch
FreeBSD xju-rtr 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r285706: Mon Jul 20
00:10:44 UTC 2015    
root at xts-bsd:/usr/obj/nanobsd.soekris/i386.i386/usr/src/head/sys/IPSEC  i386

And the resulting `netstat -s` output:
.....
    0 datagrams output
pfkey:
    10 requests sent from userland
    0 bytes sent from userland
    histogram by message type:
        getspi: 1
        acquire: 2
        #132: 1392
        #133: 1
        #134: 2
        #136: 2
        #139: 2
    0 messages with invalid length field
    0 messages with invalid version field
    0 messages with invalid message type field
    0 messages too short
    0 messages with memory allocation failure
    7 messages with duplicate extension
    0 messages with invalid extension type
    0 messages with invalid sa type
    0 messages with invalid address extension
    0 requests sent to userland
    0 bytes sent to userland
    histogram by message type:
        expire: 32
        x_spddump: 24
        x_spdflush: 24
        x_spdexpire: 592
        #164: 14976973269188063411
    0 messages toward single socket
    0 messages toward all sockets
    0 messages toward registered sockets
    0 messages with memory allocation failure

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