[tor-bugs] #5557 [Tor Bridge]: Tor helpers' launch error message contains useless whitespace

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#5557: Tor helpers' launch error message contains useless whitespace
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 Reporter:  asn         |          Owner:                    
     Type:  defect      |         Status:  needs_review      
 Priority:  normal      |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Bridge  |        Version:                    
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
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Comment(by nickm):

 Better!  Here are a couple of changes I'll  make before merging:

 In format_hex_number_for_helper_exit_status:
     * The else clause isn't how we usually write them.
     * The function should either nul-terminate its output, or warn loudly
 in its output that it doesn't NUL-terminate its output.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5557#comment:10>
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