[ghex] widget: Don't drop additional reference on menu model

[Logan Rathbone <larathbone src gnome org>]

commit c3dd145b9e2eaee1dc19dc78753f0f8fdcc981f4
Author: Logan Rathbone <poprocks gmail com>
Date:   Thu Jun 30 22:26:40 2022 -0400

    widget: Don't drop additional reference on menu model
    
    See my closing of: https://gitlab.gnome.org/GNOME/gtk/-/issues/4548

 src/gtkhex.c | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/src/gtkhex.c b/src/gtkhex.c
index a3ed1c6..763c8a4 100644
--- a/src/gtkhex.c
+++ b/src/gtkhex.c
@@ -2564,10 +2564,6 @@ hex_widget_dispose (GObject *object)
        g_clear_pointer (&self->scrollbar, gtk_widget_unparent);
        g_clear_pointer (&self->busy_spinner, gtk_widget_unparent);
 
-       /* FIXME - This results in assertion errors upon exit. I have been told
-        * by ebassi on IRC (16-Dec-2021) that this may be a bug in gtk. See:
-        * https://gitlab.gnome.org/GNOME/gtk/-/issues/4548
-        */
        g_clear_pointer (&self->context_menu, gtk_widget_unparent);
 
        /* Clear pango layouts
@@ -2959,7 +2955,6 @@ hex_widget_init (HexWidget *self)
        gtk_widget_set_parent (self->context_menu, widget);
 
        g_object_unref (builder);
-       g_object_unref (menu);          /* ref'd by gtk_popover_menu_new_from_model */
 
        /* Initialize Adjustment */
        self->adj = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);