[gnome-control-center/gnome-3-28] network: Fix warning about missing cast to GtkWidget*

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 167d11e2107e46b4621cf6fc370c5b191b4b7732
Author: Benjamin Berg <bberg redhat com>
Date:   Thu Mar 8 12:08:19 2018 +0100

    network: Fix warning about missing cast to GtkWidget*
    
    https://bugzilla.gnome.org/show_bug.cgi?id=794171
    
    
    (cherry picked from commit 72ef675a361ed9b0b7aa32bf6d127ddc0458064d)

 panels/network/connection-editor/net-connection-editor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/network/connection-editor/net-connection-editor.c 
b/panels/network/connection-editor/net-connection-editor.c
index 8c21667c6..1b268044a 100644
--- a/panels/network/connection-editor/net-connection-editor.c
+++ b/panels/network/connection-editor/net-connection-editor.c
@@ -814,7 +814,7 @@ net_connection_editor_new (GtkWindow        *parent_window,
         editor = g_object_new (NET_TYPE_CONNECTION_EDITOR, NULL);
 
         if (parent_window) {
-                editor->parent_window = g_object_ref (parent_window);
+                editor->parent_window = GTK_WIDGET (g_object_ref (parent_window));
                 gtk_window_set_transient_for (GTK_WINDOW (editor->window),
                                               parent_window);
         }