Fix memory overflow in ESQueue

                if (mSampleDecryptor != NULL && (nalType == 1 || nalType == 5)) {

                    uint8_t *nalData = mBuffer->data() + pos.nalOffset;

                    size_t newSize = mSampleDecryptor->processNal(nalData, pos.nalSize);

                    // Note: the data can shrink due to unescaping

                    // Note: the data can shrink due to unescaping, but it can never grow

                    if (newSize > pos.nalSize) {

                        // don't log unless verbose, since this can get called a lot if

                        // the caller is trying to resynchronize

                        ALOGV("expected sample size < %u, got %zu", pos.nalSize, newSize);

                        return NULL;

                    }

                    memcpy(accessUnit->data() + dstOffset + 4,

                            nalData,

                            newSize);