Fix bug in SSTImpl where connection and stream could be used in a posted handler after they had been released.
Fix bug in SSTImpl where connection and stream could be used in a posted handler after they had been released.

sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata