bstp_addr_cmp
static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
if (bstp_addr_cmp(addr1, addr2) == 0)
if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {