[tor-bugs] #30692 [Core Tor/Tor]: Write better unit tests for dirserv_load_fingerprint_file()

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#30692: Write better unit tests for dirserv_load_fingerprint_file()
------------------------------+------------------------------
     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #22029
       Points:                |   Reviewer:
      Sponsor:                |
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 The existing tests don't catch format string bugs, because they only run
 on expected inputs:
 https://github.com/torproject/tor/pull/970#pullrequestreview-242268332

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30692>
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