Check the return value of tor_inet_ntop() and tor_inet_ntoa()
The following functions don't check the return value of tor_inet_ntop() or tor_inet_ntoa():
IPv6, could be serious:
- evdns_callback(), multiple times
IPv4 only, unlikely to be a serious bug:
- tor_dup_ip()
- fmt_addr32()
- evdns_wildcard_check_callback()
These functions should log a bug log using BUG() or tor_assert_nonfatal(), and return an error. (Or for the formatting functions, a sensible placeholder string.)
We will also need to make their callers check for the error.
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