[tor-bugs] #30964 [Core Tor/Tor]: Fix shellcheck warning about unused variable in test_rebind.sh

[Tor Bug Tracker & Wiki]

#30964: Fix shellcheck warning about unused variable in test_rebind.sh
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  nickm
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  0             |   Reviewer:
      Sponsor:                |
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 {{{
 In ./src/test/test_rebind.sh line 15:
 exitcode=0
 ^------^ SC2034: exitcode appears unused. Verify use (or export if used
 externally).
 }}}

 I say "no backport" since this is  harmless.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30964>
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