Improve input validation for parameters in ASCONF and ASCONF-ACK chunks
Improve input validation for parameters in ASCONF and ASCONF-ACK chunks

Thanks to Tolya Korniltsev for drawing my attention to this part of the
code by reporting an issue for the userland stack.

CoolmanCZ/usrsctp,weinrank/usrsctp,sctplab/usrsctp,CoolmanCZ/usrsctp,weinrank/usrsctp,weinrank/usrsctp,sctplab/usrsctp,sctplab/usrsctp,CoolmanCZ/usrsctp,CoolmanCZ/usrsctp