[tor-bugs] #26780 [Core Tor/Tor]: Fix division by zero error reports from Coverity (CID: 1415721, 1415722, and 1415723)

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#26780: Fix division by zero error reports from Coverity (CID: 1415721, 1415722,
and 1415723)
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 Reporter:  ahf           |          Owner:  (none)
     Type:  defect        |         Status:  merge_ready
 Priority:  Medium        |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor  |        Version:  Tor: unspecified
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:  asn           |        Sponsor:
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Comment (by nickm):

 (If it does help, the answer is to use the same approach elsewhere.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26780#comment:7>
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