Initialise m_qtPushButton in wxAnyButton's constructor.

include/wx/qt/anybutton.h

@@ -18,9 +18,7 @@ class QPushButton;
 class WXDLLIMPEXP_CORE wxAnyButton : public wxAnyButtonBase
 {
 public:
-    wxAnyButton()
-    {
-    }
+    wxAnyButton();
 
     // implementation
     // --------------

src/qt/anybutton.cpp

@@ -46,6 +46,12 @@ void wxQtPushButton::clicked( bool WXUNUSED(checked) )
     }
 }
 
+wxAnyButton::wxAnyButton() :
+    m_qtPushButton(NULL)
+{
+}
+
+
 void wxAnyButton::QtCreate(wxWindow *parent)
 {
     // create the default push button (used in button and bmp button)