* libinet6/getnameinfo.c: use EAI_xx for error code.  rfc2553bis   suggests it.  the commit corrects old behavior on invalid socket,   where getnameinfo returned 0 (success).
* libinet6/getnameinfo.c: use EAI_xx for error code.  rfc2553bis
  suggests it.  the commit corrects old behavior on invalid socket,
  where getnameinfo returned 0 (success).

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame