[Qt4-preview-feedback] 4.5.0 rc1 crash

[Raul Metsma]

I was able produce crash on
qsvghandler.cpp:2647
     grad->setColorAt(qQNaN(), QColor());

qbrush.cpp:1322
     if (pos > 1 || pos < 0) {

changing last line to
     if (qIsNaN(pos) || pos > 1 || pos < 0) {

Fixes problem

Raul