Hast locking up under 9.2

[Pete French]

> It looks you were using the first version of my patch. This was false
> positive: memsyncack may be false here if the request to the secondary
> failed, e.g. due to disconnect. I fixed this later but forgot to
> mention. Please use the latest patch:

Actually, that assertions was from the unpatched code - I should have
made that clear.

> http://people.freebsd.org/~trociny/patches/hast.primary.c.memsync_write_complete.2.patch

Will try and give this a test today. My hast stuff is getting a bit more
complex due to the fact I;ve out one of them back into production with
fullsync enabled as I have verified it works like that. WIll try this on the
other drive later today though.

-pete.

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