[tor-bugs] #31923 [Core Tor/Tor]: Fix a typo in log.c

[Tor Bug Tracker & Wiki]

#31923: Fix a typo in log.c
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  comment-only
Actual Points:  0             |  Parent ID:
       Points:  0             |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 log_fn_() says "calling functions" not "calling function".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31923>
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