[tor-bugs] #29145 [Core Tor/Tor]: Fix a compiler warning on OpenBSD in test-memwipe.c

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#29145: Fix a compiler warning on OpenBSD in test-memwipe.c
-------------------------------------------------+-------------------------
 Reporter:  kjak                                 |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  041-proposed 029-backport            |  Actual Points:
  033-backport 034-backport 035-backport         |
  040-backport                                   |
Parent ID:                                       |         Points:  0.1
 Reviewer:  ahf                                  |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 (This branch was accidentally pushed to
 https://gitweb.torproject.org/tor.git/
 See #29531 for the delete request, and #29532 for the permanent fix.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29145#comment:10>
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