Merge "Check for nullptr when casting IBinder to IBase."

    using android::hidl::manager::V1_0::IServiceManager;

    sp<hardware::IBinder> binder = JHwBinder::GetNativeContext(env, thiz);

    sp<hidl::base::V1_0::IBase> base = hidl::base::V1_0::IHwBase::asInterface(binder);

    if (base.get() == nullptr) {

        LOG(ERROR) << "IBinder object cannot be casted to the base interface.";

        signalExceptionForError(env, UNKNOWN_ERROR);

        return;

    }

    bool ok = hardware::defaultServiceManager()->add(

                interfaceChain,

                serviceName,