Merge "MatroskaExtractor: handle parse error." into pi-dev

            res = mCluster->Parse(pos, len);

            ALOGV("Parse (2) returned %ld", res);

            CHECK_GE(res, 0);

            if (res < 0) {

                // I/O error

                ALOGE("Cluster::Parse returned result %ld", res);

                mCluster = NULL;

                break;

            }

            mBlockEntryIndex = 0;

            continue;