AACExtractor: check bounds during seek

    if (options && options->getSeekTo(&seekTimeUs, &mode)) {

        if (mFrameDurationUs > 0) {

            int64_t seekFrame = seekTimeUs / mFrameDurationUs;

            if (seekFrame < 0 || seekFrame >= (int64_t)mOffsetVector.size()) {

                android_errorWriteLog(0x534e4554, "70239507");

                return ERROR_MALFORMED;

            }

            mCurrentTimeUs = seekFrame * mFrameDurationUs;

            mOffset = mOffsetVector.itemAt(seekFrame);