INIT-Chunk with cropped FORWARD-TSN-supported parameter is accepted

[TheAomx]

An INIT-Chunk with an cropped FORWARD-TSN-supported parameter (2 bytes instead of 4 bytes) is accepted by the FreeBSD-Kernel and results in sending an INIT-ACK-Chunk instead of an expected ABORT-Chunk.

See the folloing test-case for more details:

• https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/error-cases/init-with-forward-tsn-too-short.pkt