PathStrokeRenderer::initializePoints(): use float division

The (example) code used a real to hold 360 / 7, which is of course 51,
discarding the 3/7 that was most likely meant to be kept.  Noticed by
Coverity (CID 22364).  Use 360.0 instead of 360 to get more accurate
results.

Change-Id: Ifdfbb932589d8ea728710e8b656af651c9f8a7d2
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

examples/widgets/painting/pathstroke/pathstroke.cpp

@@ -477,7 +477,7 @@ void PathStrokeRenderer::initializePoints()
     m_vectors.clear();
 
     QMatrix m;
-    qreal rot = 360 / count;
+    qreal rot = 360.0 / count;
     QPointF center(width() / 2, height() / 2);
     QMatrix vm;
     vm.shear(2, -1);