[gtk] textview: use g_slice_new0 for proper initial state

[Christian Hergert <chergert src gnome org>]

commit 6d16f7ad3597149e2da75913173f3d76c77fee74
Author: Christian Hergert <chergert redhat com>
Date:   Fri Nov 1 11:32:31 2019 -0700

    textview: use g_slice_new0 for proper initial state
    
    This fixes the missuse of the GList embedded node for prev/next.

 gtk/gtktextview.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index c82fcf792e..766060aff7 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -9293,7 +9293,7 @@ anchored_child_new (GtkWidget          *child,
 {
   AnchoredChild *vc;
 
-  vc = g_slice_new (AnchoredChild);
+  vc = g_slice_new0 (AnchoredChild);
   vc->link.data = vc;
   vc->widget = g_object_ref (child);
   vc->anchor = g_object_ref (anchor);