seq_less
if (seq_less(seq, r->head_seq_num)) {
if (seq_less(seq, r->head_seq_num)) {
if (!seq_less(seq, r->head_seq_num + r->buf_size)) {
if (seq_less(seq, r->head_seq_num)) {
while (seq_less(r->head_seq_num, hseq) && r->stored_mpdu_num) {