log_addr_has_changed() does not heed SafeLogging

No IP address scrubbing is performed at any loglevel:

2694   if (!tor_addr_is_null(prev))
2695     log_fn(severity, LD_GENERAL,
2696            "Our IP Address has changed from %s to %s; "
2697            "rebuilding descriptor (source: %s).",
2698            addrbuf_prev, addrbuf_cur, source);
2699   else
2700     log_notice(LD_GENERAL,
2701              "Guessed our IP address as %s (source: %s).",
2702              addrbuf_cur, source);