Fix illegal C++ use of reinterpret_cast<> to cast between nullptr_t and a pointer.
Fix illegal C++ use of reinterpret_cast<> to cast between nullptr_t and a pointer.

google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf