Update rte_mbuf_sanity_check() to check sanity of data_len and pkt_len
fields. For segmented packets it is supposed that head's pkt_len field
should be the sum of all segments data_len values.
Signed-off-by: Ilya V. Matveychikov <matvejchikov@gmail.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>