ncd: NCDInterpreter: avoid a loop over all statements in process_free() if no statement memory was allocated
ncd: NCDInterpreter: avoid a loop over all statements in process_free() if no statement memory was allocated

DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn