Fix: doRunAdvance returns wrong value when offset == count.

    static jfloat doRunAdvance(const Paint* paint, TypefaceImpl* typeface, const jchar buf[],

            jint start, jint count, jint bufSize, jboolean isRtl, jint offset) {

        int bidiFlags = isRtl ? kBidi_Force_RTL : kBidi_Force_LTR;

        if (offset == count) {

        if (offset == start + count) {

            return MinikinUtils::measureText(paint, bidiFlags, typeface, buf, start, count,

                    bufSize, nullptr);

        }