new wxRegionRefData has size=1 so rects=malloc(sizeof(BOX))

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26756 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/regiong.cpp

@@ -166,7 +166,7 @@ public:
     /* XCreateRegion */
     {   size = 1;
         numRects = 0;
-        rects = NULL;
+        rects = ( BOX * )malloc( (unsigned) sizeof( BOX ));
         extents.x1 = 0;
         extents.x2 = 0;
         extents.y1 = 0;