set pointer to NULL after deletion
set pointer to NULL after deletion

toolmmy/libjson-rpc-cpp,toolmmy/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,toolmmy/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,toolmmy/libjson-rpc-cpp