[libhandy] header-group: add weak reference instead of removing it

[Alexander Mikhaylenko <alexm src gnome org>]

commit 923b226ec817c78758158256361296e6c838fd27
Author: Julian Sparber <julian sparber net>
Date:   Mon Oct 5 15:29:42 2020 +0200

    header-group: add weak reference instead of removing it
    
    Fix: https://gitlab.gnome.org/GNOME/libhandy/-/issues/305

 src/hdy-header-group.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/hdy-header-group.c b/src/hdy-header-group.c
index e8287fad..ce155df1 100644
--- a/src/hdy-header-group.c
+++ b/src/hdy-header-group.c
@@ -230,7 +230,7 @@ hdy_header_group_child_new_for_header_group (HdyHeaderGroup *header_group)
   self->type = HDY_HEADER_GROUP_CHILD_TYPE_HEADER_GROUP;
   self->object = G_OBJECT (header_group);
 
-  g_object_weak_unref (G_OBJECT (header_group), (GWeakNotify) object_destroyed_cb, self);
+  g_object_weak_ref (G_OBJECT (header_group), (GWeakNotify) object_destroyed_cb, self);
 
   g_signal_connect_swapped (header_group, "update-decoration-layouts", G_CALLBACK 
(forward_update_decoration_layouts), self);