Fix. [ffi] GC collect socket handles returned by `reset_handle`.
Fix. [ffi] GC collect socket handles returned by `reset_handle`.

zeromq/lzmq,moteus/lzmq,zeromq/lzmq,LuaDist/lzmq,bsn069/lzmq,moteus/lzmq,zeromq/lzmq,moteus/lzmq,LuaDist/lzmq-ffi,bsn069/lzmq,LuaDist/lzmq-ffi,LuaDist/lzmq