fill_pxmask_family
if (fill_pxmask_family(dst->sa_family, plen, dst, &netmask))
if (!fill_pxmask_family(dst->sa_family, plen, dst, &netmask)) {
if (!fill_pxmask_family(dst->sa_family, plen, dst, &netmask)) {
static bool fill_pxmask_family(int family, int plen, struct sockaddr *_dst,