[tor-bugs] #19947 [Core Tor/Tor]: NULL %s in fmt string (dir_server_new() - routerlist.c)

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#19947: NULL %s in fmt string (dir_server_new() - routerlist.c)
------------------------------+-----------------
     Reporter:  rubiate       |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+-----------------
 in src/or/routerlist.c:4545-4550 `hostname` passed to tor_asprintf() can
 be NULL such as when dir_server_new() is called from
 fallback_dir_server_new()

 Found this because recent OpenBSD -current whinges about it in syslog:

     tor: vfprintf %s NULL in "directory server at %s:%d"
     last message repeated 88 times

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19947>
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