Remove unused structures.
Remove unused structures.

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