Problem: generated class stub uses int return for selftest
Problem: generated class stub uses int return for selftest

Conventionally the selftest has no return value; if it fails it
raises an assertion.

Solution: change method type to "void" and remove return statement.

zeromq/zproject,awynne/zproject,hintjens/zproject,Asmod4n/zproject,Asmod4n/zproject,taotetek/zproject,paddor/zproject,eburkitt/zproject,keent/zproject,hintjens/zproject,twhittock/zproject,jemc/zproject,taotetek/zproject,keent/zproject,paddor/zproject,trevorbernard/zproject,zeromq/zproject,jemc/zproject,zeromq/zproject,taotetek/zproject,eburkitt/zproject,mvala/zproject,paddor/zproject,asokoloski/zproject,miska/zproject,asokoloski/zproject,twhittock/zproject,awynne/zproject,mvala/zproject,oikosdev/zproject