last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
ASSERT (total_length >= first_b->current_length);
last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
ASSERT (total_length >= first_b->current_length);