[glade] GladeGtkGrid: fix tests

[Juan Pablo Ugarte <jpu src gnome org>]

commit 89bf07f696044729bf299cdb6514fa7655d66a47
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Sat Sep 19 14:30:27 2020 -0300

    GladeGtkGrid: fix tests
    
    Fix glade_gtk_grid_add_child() return after adding child to avoid
    adding it more than once.

 plugins/gtk+/glade-gtk-grid.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/plugins/gtk+/glade-gtk-grid.c b/plugins/gtk+/glade-gtk-grid.c
index fc80d758..a940ae6d 100644
--- a/plugins/gtk+/glade-gtk-grid.c
+++ b/plugins/gtk+/glade-gtk-grid.c
@@ -306,12 +306,12 @@ glade_gtk_grid_add_child (GladeWidgetAdaptor *adaptor,
               {
                 gtk_container_remove (GTK_CONTAINER (grid), child_widget);
                 gtk_grid_attach (grid, GTK_WIDGET (child), x, y, 1, 1);
-                break;
+                return;
               }
           }
     }
-  else
-    gtk_container_add (GTK_CONTAINER (object), GTK_WIDGET (child));
+
+  gtk_container_add (GTK_CONTAINER (object), GTK_WIDGET (child));
 
   glade_gtk_grid_refresh_placeholders (GTK_GRID (object), FALSE);
 }