[gtk: 1/2] print-editor: Fix crash

[Matthias Clasen <matthiasc src gnome org>]

commit fcbc972c2a491494fb42768ff8dbe65a32539b01
Author: Alexander Larsson <alexl redhat com>
Date:   Wed May 13 10:18:17 2020 +0200

    print-editor: Fix crash
    
    We're trying to g_free a GFile, which is not good...

 demos/print-editor/print-editor.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/demos/print-editor/print-editor.c b/demos/print-editor/print-editor.c
index 37ea8cf7ca..c2819bf8c9 100644
--- a/demos/print-editor/print-editor.c
+++ b/demos/print-editor/print-editor.c
@@ -583,8 +583,7 @@ activate_new (GSimpleAction *action,
               GVariant      *parameter,
               gpointer       user_data)
 {
-  g_free (filename);
-  filename = NULL;
+  g_clear_object (&filename);
   set_text ("", 0);
 }