[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
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     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:          |
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Changes (by teor):

 * status:  new => needs_review


Comment:

 '''Branch:''' bug16115-minor-fixes
 '''Repository:''' https://github.com/teor2345/tor.git
 '''Commits:'''
 * Fix an incorrect comment on spawn_func
 * Silence unused variable warnings in find_cipher_by_id
 * Always initialise variable in compute_desc_id in rendcommon.c
 * Remove undefined directive-in-macro in test_util_writepid
 * Ensure signing_key is non-NULL before accessing one of its members
 * Check for NULL values in getinfo_helper_onions

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16115#comment:1>
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