[libgd] GdStack: fix forall loop during destruction

[Paolo Borelli <pborelli src gnome org>]

commit c8dfab9f27ded966ea417a2cefbc8980f43b9c02
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Feb 16 17:06:32 2013 +0100

    GdStack: fix forall loop during destruction

 libgd/gd-stack.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/libgd/gd-stack.c b/libgd/gd-stack.c
index 0d3a1b8..4ec26ba 100644
--- a/libgd/gd-stack.c
+++ b/libgd/gd-stack.c
@@ -773,9 +773,12 @@ gd_stack_forall (GtkContainer *container,
   GdStackChildInfo *child_info;
   GList *l;
 
-  for (l = priv->children; l != NULL; l = l->next)
+  l = priv->children;
+  while (l)
     {
       child_info = l->data;
+      l = l->next;
+
       (* callback) (child_info->widget, callback_data);
     }
 }