[glade] gtk+: properly cast to avoid warnings

[Alberto Fanjul <albfan src gnome org>]

commit 5f0624c8dc52bf46ee54d3cf1466f5eeb183f030
Author: Victor Toso <me victortoso com>
Date:   Wed Nov 6 11:24:17 2019 +0100

    gtk+: properly cast to avoid warnings
    
    In order to avoid:
     > ../plugins/gtk+/glade-gtk-list-box.c:235:29: warning: passing
     > argument 2 of ‘glade_project_is_selected’ from incompatible
     > pointer type [-Wincompatible-pointer-types]
     >
     >   235 |                   (project, child) == FALSE)
     >       |                             ^~~~~
     >       |                             |
     >       |                             GtkWidget * {aka struct _GtkWidget *}
     >
     > ../plugins/gtk+/glade-gtk-list-box.c:236:55: warning: passing
     > argument 2 of ‘glade_project_selection_set’ from incompatible
     > pointer type [-Wincompatible-pointer-types]
     >
     >   236 |                 glade_project_selection_set (project, child, FALSE);
     >       |                                                       ^~~~~
     >       |                                                       |
     >       |                                                       GtkWidget * {aka struct _GtkWidget *}

 plugins/gtk+/glade-gtk-list-box.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/gtk+/glade-gtk-list-box.c b/plugins/gtk+/glade-gtk-list-box.c
index b91828ad..109a80b3 100644
--- a/plugins/gtk+/glade-gtk-list-box.c
+++ b/plugins/gtk+/glade-gtk-list-box.c
@@ -232,8 +232,8 @@ glade_gtk_listbox_set_property (GladeWidgetAdaptor *adaptor,
               GladeProject *project = glade_widget_get_project (glade_widget_get_from_gobject (object));
               /* Assign selection first */
               if (glade_project_is_selected
-                  (project, child) == FALSE)
-                glade_project_selection_set (project, child, FALSE);
+                  (project, G_OBJECT (child)) == FALSE)
+                glade_project_selection_set (project, G_OBJECT (child), FALSE);
 
               glade_project_command_delete (project);
               glade_project_selection_set (project, object, TRUE);