freebsd build error (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 827b9866 arm64: fix struct l_sigaction_t layout
git tree: freebsd
console output: https://syzkaller.appspot.com/x/log.txt?x=171ecc13500000
dashboard link: https://syzkaller.appspot.com/bug?extid=b34216c56616c7a65490

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b34216...@syzkaller.appspotmail.com

sys/net/if_lagg.c:1809:3: error: implicit declaration of function 'LAGG_RUNLOCK' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
sys/net/if_lagg.c:1813:3: error: implicit declaration of function 'LAGG_RUNLOCK' is invalid in C99 [-Werror,-Wimplicit-function-declaration]

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