create constant to represent null pointer address
create constant to represent null pointer address

AlexeyRaga/eta,rahulmutt/ghcvm,AlexeyRaga/eta,AlexeyRaga/eta,AlexeyRaga/eta,pparkkin/eta,pparkkin/eta,pparkkin/eta,rahulmutt/ghcvm,rahulmutt/ghcvm,AlexeyRaga/eta,pparkkin/eta,rahulmutt/ghcvm,rahulmutt/ghcvm,pparkkin/eta