Slightly simply wxScrollHelperBase::ScrollLayout()

No real changes, just use wxPoint and wxSize instead of intermediate int
variables.

src/generic/scrlwing.cpp

@@ -767,10 +767,8 @@ bool wxScrollHelperBase::ScrollLayout()
         // If we're the scroll target, take into account the
         // virtual size and scrolled position of the window.
 
-        int x = 0, y = 0, w = 0, h = 0;
-        CalcScrolledPosition(0,0, &x,&y);
-        m_win->GetVirtualSize(&w, &h);
-        m_win->GetSizer()->SetDimension(x, y, w, h);
+        m_win->GetSizer()->SetDimension(CalcScrolledPosition(wxPoint(0, 0)),
+                                        m_win->GetVirtualSize());
         return true;
     }