choose_good_entry_server() is no longer used to choose entry guards
* If <b>state</b> is NULL, we're choosing a router to serve as an entry * guard, not for any particular circuit.
But in 0.3.0 and later, we use guardsets to choose entry guards. (And we use this function to choose individual entries.)
- fix the comment,
- check for NULL state (and do what?), and
- make sure that guard selection and entry selection doesn't get out of sync. (I think we're ok here, but I don't understand the new guard code very well.)
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