made _save function discard the underlying object

diff --git a/lib/python/gfx.c b/lib/python/gfx.c
index 336d162..016d1ce 100644 (file)
--- a/lib/python/gfx.c
+++ b/lib/python/gfx.c
@@ -89,6 +89,7 @@ static PyObject* output_save(PyObject* _self, PyObject* args, PyObject* kwargs)
        return NULL;
 
     gfxresult_t*result = self->output_device->finish(self->output_device);
+    self->output_device = 0;
     if(result->save(result, filename) < 0) {
        return PY_ERROR("Couldn't write to %s", filename);
     }