sysctl lock in RELENG_6

[Eugene Grosbein]

> > Well, my 6.3-STABLE locked very often (sometimes every hour).
> > Yesterday I've upgraded it to 6.4-STABLE, applied 1.177.2.1 of the file
> > to sources, rebuilt NanoBSD image and ran it. It has not locked yet.
> Can you be slightly more scientific in your tests ?
> Try RELENG_6 without my patch to see whether it is needed at all.

It locked again today running recent 6.4-STABLE without your patch.
There is a difference - it took more than a week to lock,
6.3-STABLE did this very often.

Now I'll run it with your patch applied.

Eugene Grosbein