Fix playing sound in loop if sample size is small

If sample size is smaller that current periodsize,
then playing sample multiple times in loop will fail.
Reason is data offset of sample is set out of the
bounds actual sample data size.

Change-Id: I81f580cbb8dabf89db0d61528f5f1c9489216e0c
Task-number: QTBUG-49838
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/multimedia/audio/qsoundeffect_qaudio_p.cpp

@@ -395,6 +395,8 @@ qint64 PrivateSoundSource::readData( char* data, qint64 len)
                 memcpy(data + dataOffset, sampleData + m_offset, sampleSize - m_offset);
                 bytesWritten += sampleSize - m_offset;
                 int wrapLen = periodSize - (sampleSize - m_offset);
+                if (wrapLen > sampleSize)
+                    wrapLen = sampleSize;
 #ifdef QT_QAUDIO_DEBUG
                 qDebug() << "END OF SOUND: bytesWritten=" << bytesWritten << ", offset=" << m_offset
                          << ", part1=" << (sampleSize-m_offset);