[PATCH] Minor cleanup in tevent.

[Jeremy Allison]

Comment says most of it :-). I like this as it
moves declaration closer to variable use and
removes a long-term state store that can get
out of sync with reality. I think it's safe as it's
using ev->wakeup_fd immediately in the same code
that also uses the event context ev in a linked
list manipulation so we know ev exists and is OK to use.

Passes local autobuilds.

Please review and push if happy.

Jeremy.
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