In the case whare two packets like this were received:

P1
+----------------+-------------+---------------+
| data (X bytes) | header (2b) | data (1 byte) |
+----------------+-------------+---------------+

P2
+----------------+
| data (X bytes) |
+----------------+

The RTP loop used the last byte of p1 and the first
byte of P2 as the header. Leading to malformed packets

Change-Id: Ie714fcf0bab1e372f7433342ed60ed4e6d20aff3