Length in IP header ignored by the code

[aasselin]

Hello

The code introduced here ignores the length of the data as expressed in the header:

tcpflow/src/tcpdemux.cpp

Line 748 in 6fd956d

uint16_t ip_payload_len = pi.ip_datalen - ip_header_len;

The previous code was right.

In our use case, there 2 to 6 bytes of padding introduced by some hardware (router or such).

The new code pushes this code to the data, it provokes tons of warnings and strange errors.
Regards

[aasselin]

sorry duplicate of #249