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launch_resolve() leaks addr if DisableNetwork is set or the nameservers can't be configured.

static int
launch_resolve(edge_connection_t *exitconn)
{
  char *addr = tor_strdup(exitconn->_base.address);
  struct evdns_request *req = NULL;
  tor_addr_t a;
  int r;
  int options = get_options()->ServerDNSSearchDomains ? 0
    : DNS_QUERY_NO_SEARCH;

  if (get_options()->DisableNetwork)
    return -1;

  /* What? Nameservers not configured?  Sounds like a bug. */
  if (!nameservers_configured) {
    log_warn(LD_EXIT, "(Harmless.) Nameservers not configured, but resolve "
             "launched.  Configuring.");
    if (configure_nameservers(1) < 0) {
      return -1;
    }
  }