[dia] PyDia: fix wrong cast to Diagram* were DiagramData* was intended

[Hans Breuer <hans src gnome org>]

commit 09d5bb28a190cc794e13e6a60d5f2eb7bf1e3f75
Author: Hans Breuer <hans breuer org>
Date:   Fri May 2 00:41:59 2014 +0200

    PyDia: fix wrong cast to Diagram* were DiagramData* was intended

 plug-ins/python/pydia-diagramdata.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/python/pydia-diagramdata.c b/plug-ins/python/pydia-diagramdata.c
index 4dc3f0c..d95ca22 100644
--- a/plug-ins/python/pydia-diagramdata.c
+++ b/plug-ins/python/pydia-diagramdata.c
@@ -342,7 +342,7 @@ static PyMemberDef PyDiaDiagramData_Members[] = {
 static PyObject *
 PyDiaDiagramData_GetAttr(PyDiaDiagramData *self, gchar *attr)
 {
-    Diagram *diagram = DIA_DIAGRAM(self->data);
+    Diagram *diagram = DIA_DIAGRAM_DATA(self->data);
 
     if (!strcmp(attr, "__members__"))
        return Py_BuildValue("[ssssssssssss]",