Don't permanently close UDP listeners on error
Don't permanently close UDP listeners on error

Also, don't inflate rbytes as we can only ever process one UDP packet at a
time.

Patch by pi3orama. Fixed by Dormando to use the correct state and actually
work.

I'm not fully convinced of the rbytes bit. We must ensure that a UDP packet
with multiple commands in it has all of its commands processed before we can
possibly call recvfrom again.

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