Merge "audiopolicy: add null pointer check for primary hw"

    std::unordered_set<audio_format_t> formatSet;

    sp<HwModule> primaryModule =

            mHwModules.getModuleFromName(AUDIO_HARDWARE_MODULE_ID_PRIMARY);

    if (primaryModule == nullptr) {

        ALOGE("%s() unable to get primary module", __func__);

        return NO_INIT;

    }

    DeviceVector declaredDevices = primaryModule->getDeclaredDevices().getDevicesFromTypeMask(

            AUDIO_DEVICE_OUT_ALL_A2DP);

    for (const auto& device : declaredDevices) {