Merge "Fix missing check of hidl return status"

void DrmHal::closeOpenSessions() {

    if (mPlugin != NULL) {

        for (size_t i = 0; i < mOpenSessions.size(); i++) {

            mPlugin->closeSession(toHidlVec(mOpenSessions[i]));

            DrmSessionManager::Instance()->removeSession(mOpenSessions[i]);

        auto openSessions = mOpenSessions;

        for (size_t i = 0; i < openSessions.size(); i++) {

            closeSession(openSessions[i]);

        }

    }

    mOpenSessions.clear();