[tor-bugs] #24584 [Core Tor/Tor]: Fix memory-leaked event_base_once() users.

[Tor Bug Tracker & Wiki]

#24584: Fix memory-leaked event_base_once() users.
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     Reporter:  nickm         |      Owner:  nickm
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #23847
       Points:                |   Reviewer:
      Sponsor:                |
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 The event_base_once() function is prone to leak memory on event loop exit.
 This becomes a bigger problem once #23847 is in place.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24584>
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