[gtk+/portal] Don't leak manually constructed D-Bus messages

[Matthias Clasen <matthiasc src gnome org>]

commit bd6adf7d75c02f9980c5b97d517e3f6b89295f84
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 6 20:32:56 2016 -0400

    Don't leak manually constructed D-Bus messages
    
    Spotted by Cosimo.

 gtk/gtkfilechoosernativeportal.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkfilechoosernativeportal.c b/gtk/gtkfilechoosernativeportal.c
index 12377d7..48deff3 100644
--- a/gtk/gtkfilechoosernativeportal.c
+++ b/gtk/gtkfilechoosernativeportal.c
@@ -163,6 +163,8 @@ send_close (FilechooserPortalData *data)
       g_warning ("unable to send FileChooser Close message: %s", error->message);
       g_error_free (error);
     }
+
+  g_object_unref (message);
 }
 
 static void
@@ -387,6 +389,8 @@ gtk_file_chooser_native_portal_show (GtkFileChooserNative *self)
                                              open_file_msg_cb,
                                              data);
 
+  g_object_unref (message);
+
   self->mode_data = data;
   return TRUE;
 }