fix vlib_buffer_chain_compress assert in debug
replace vlib_buffer_advance with its code to work around assert
@@ -1244,7 +1244,8 @@ vlib_buffer_chain_compress (vlib_main_t * vm,
first->current_length,
vlib_buffer_get_current (second), amount_to_copy);
first->current_length += amount_to_copy;
- vlib_buffer_advance (second, amount_to_copy);
+ second->current_data += amount_to_copy;
+ second->current_length -= amount_to_copy;
if (first->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
{
first->total_length_not_including_first_buffer -= amount_to_copy;
