Fix compile breakage under INVARIANTS
Fix compile breakage under INVARIANTS

Reported by Randell Jesup.

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