[tor-bugs] #30527 [Core Tor/Tor]: Fix coverity warnings in test_parsecommon.c

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#30527: Fix coverity warnings in test_parsecommon.c
------------------------------------------------+--------------------------
 Reporter:  nickm                               |          Owner:  nickm
     Type:  defect                              |         Status:
                                                |  needs_review
 Priority:  Medium                              |      Milestone:  Tor:
                                                |  0.4.2.x-final
Component:  Core Tor/Tor                        |        Version:
 Severity:  Normal                              |     Resolution:
 Keywords:  coverity technical-debt 042-should  |  Actual Points:  0
Parent ID:                                      |         Points:  .5
 Reviewer:  teor                                |        Sponsor:
                                                |  Sponsor31-can
------------------------------------------------+--------------------------

Comment (by teor):

 I don't have a copy of the coverity email with these defects: it may have
 been eaten by a spam filter.
 (In future, let's copy the defect text into the ticket?)

 I'll use the online interface to check for coverity issues in
 test_parsecommon.c from approximately May 2019.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30527#comment:5>
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