SCCP reassembly broken for duplicateded SCTP messages.

[Anders Broman <anders.broman () ericsson com>]

Hi,
SCCP reassembly will add both segments from duplicated packets thus producing garbage in the reassembled packet.
An "easy" fix could perhaps bee to add a flag in pinfo "duplicate" or "suspected duplicate" and ignore such frames in 
reassembly, possibly the
Dissector doing reassembly could have a preference wether to use the flag or not - thoughts?

There is a similar bug in the TCP reassembly causing it to not show the reassembled packet.
1 0.000000 10.80.79.132 10.62.180.97 TCP [TCP segment of a reassembled PDU]
2 0.000004 10.80.79.132 10.62.180.97 TCP [TCP segment of a reassembled PDU]
3 0.238283 10.80.79.132 10.62.180.97 TCP [TCP Retransmission] [TCP segment of a reassembled PDU]
4 0.716280 10.80.79.132 10.62.180.97 TCP [TCP Retransmission] [TCP segment of a reassembled PDU]


Best regards
Anders


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