Integer-overflow in QFixed::fromReal(qreal r) through QImage::.loadFromData(QByteArray);

1. Configure Qt with "-sanitize fuzzer-no-link -sanitize undefined" and build it.
2. Use this to build the project qtbase/tests/libfuzzer/gui/image/qimage/loadfromdata/loadfromdata.pro .
3. Run the resulting program passing the attached input file:

   ./loadfromdata 25484.svg
   

   You'll get output containing a line like:

   ../../include/QtGui/5.15.3/QtGui/private/../../../../../../../../src/qt-5.15-base_svg-12.07/qtbase/src/gui/painting/qfixed_p.h:71:78: runtime error: 1,77778e+11 is outside the range of representable values of type 'int'
   

Found by oss-fuzz as issue 25484.