Locking fixes for ef(4) - testers needed

Hello,

Here is a patch for ef(4) which adds some locking:

http://freebsd.czest.pl/dunstan/FreeBSD/if_ef.1.patch

It's known to be not entirely right, but could be commited to improve
current situation of ef(4). Testers are welcome.

Thanks,
--
Wojciech A. Koszek
wkoszek@xxxxxxxxxxx
http://FreeBSD.czest.pl/dunstan/
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