Warning fix.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32635 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/image.cpp

@@ -820,7 +820,7 @@ void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, uns
         x2 = rect.GetRight() + 1,
         y2 = rect.GetBottom() + 1;
 
-    unsigned char *data = NULL;
+    unsigned char *data wxDUMMY_INITIALIZE(NULL);
     int x, y, width = GetWidth();
     for (y = y1; y < y2; y++)
     {