[tor-bugs] #16115 [Tor]: minor fixes: uninitialized values, undefined macros, missing pointer checks, wrong comments, spacing

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#16115: minor fixes: uninitialized values, undefined macros, missing pointer
checks, wrong comments, spacing
------------------------+--------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  needs_review
     Priority:  normal  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor     |    Version:  Tor: 0.2.7.1-alpha
   Resolution:          |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |
------------------------+--------------------------------

Comment (by teor):

 These are all from 0.2.7.1-alpha and newer, except for the comment on
 spawn_func.
 Therefore, no backport is required.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16115#comment:2>
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