[tor-bugs] #28880 [Core Tor/Tor]: Fix a few scan-build warnings in the unit tests

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#28880: Fix a few scan-build warnings in the unit tests
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 Reporter:  nickm         |          Owner:  nickm
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:  Tor: 0.4.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:  0
 Reviewer:                |        Sponsor:
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Changes (by nickm):

 * status:  assigned => needs_review


Comment:

 Branch is `ticket28880`; PR is https://github.com/torproject/tor/pull/598

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28880#comment:1>
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