Turn off MPSAFE

After a lot of debugging constant hard freeezes on -CURRENT from the end of Novemeber, iwi0 does not seem to like MPSAFE. Box is back to snappy now.

> uname -a
FreeBSD 7.0-CURRENT FreeBSD 7.0-CURRENT #11: Sat Dec 9 11:56:55 IST 2006 i386
> grep mpsafe /boot/loader.conf.local

At some point in time I do have to report back to -current with the LORs which do turn up with WITNESS and INVARIANTS enabled in the kernel.

See for more on the mpsafe work doing as part of the SMP scaling efforts on FreeBSD

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