Memory corruption may be caused by VNC code on i386 platform

In the function QVNCServer::convertPixels() (src/plugins/gfxdrivers/vnc/qscreenvnc_qws.cp around line 1450) in certain situation byte counter used as index for writing into last element of quint32 array (dereferences dst32 pointer)

quint32 *dst32 = reinterpret_cast<quint32*>(dst);
int count32 = count * sizeof(quint16) / sizeof(quint32);
while (count32--) {
...
    *dst32++ = result2;
    *dst32++ = result1;
}
if (count & 0x1) {
...
    dst32[count - 1] = qt_conv16ToRgb(src16[count - 1]);
}

write to dst32[count - 1] will cause memory corruption outside of intended buffer.

To fix the issue we replaced last assignment with:

*dst32 = qt_conv16ToRgb(src16[count - 1]);