Fix unused variable warnings

samples/image/canvas.cpp

@@ -386,6 +386,9 @@ MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
     //
     // my_png_from_mem = wxBitmap::NewFromPNGData(cursor_png, WXSIZEOF(cursor_png));
     my_png_from_mem = wxBITMAP_PNG_FROM_DATA(cursor);
+
+    // prevent -Wunused-const-variable when compiler fails to detect its usage
+    wxUnusedVar(cursor_png);
 }
 
 MyCanvas::~MyCanvas()

tests/benchmarks/ipcclient.cpp

@@ -122,7 +122,6 @@ public:
 private:
     PokeAdviseClient *m_client;
     PokeAdviseConn *m_conn;
-    bool m_initDone;
 
     wxDECLARE_NO_COPY_CLASS(PokeAdvisePersistentConnection);
 };