[glib] Optimize g_[s]list_free_full a bit

[Matthias Clasen <matthiasc src gnome org>]

commit 98b667d052b1274f80b8898a32d0753e9e2e5c1a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 10 20:42:58 2011 -0400

    Optimize g_[s]list_free_full a bit
    
    No need to iterate the list twice.
    Proposed by Luiz Augusto von Dentz,
    http://bugzilla.gnome.org/show_bug.cgi?id=653935

 glib/glist.c  |   11 ++++++++---
 glib/gslist.c |   17 +++++++++++------
 2 files changed, 19 insertions(+), 9 deletions(-)
---
diff --git a/glib/glist.c b/glib/glist.c
index 1e3dd86..7f5df44 100644
--- a/glib/glist.c
+++ b/glib/glist.c
@@ -212,10 +212,15 @@ g_list_free_1 (GList *list)
  */
 void
 g_list_free_full (GList          *list,
-		  GDestroyNotify  free_func)
+                  GDestroyNotify  free_func)
 {
-  g_list_foreach (list, (GFunc) free_func, NULL);
-  g_list_free (list);
+  while (list)
+    {
+      GList *next = list->next;
+      (*free_func) (list->data);
+      _g_list_free1 (list);
+      list = next;
+    }
 }
 
 /**
diff --git a/glib/gslist.c b/glib/gslist.c
index 1de9c57..96ba579 100644
--- a/glib/gslist.c
+++ b/glib/gslist.c
@@ -197,17 +197,22 @@ g_slist_free_1 (GSList *list)
  * @list: a pointer to a #GSList
  * @free_func: the function to be called to free each element's data
  *
- * Convenience method, which frees all the memory used by a #GSList, and
- * calls the specified destroy function on every element's data.
+ * Convenience method, which frees all the memory used by a #GSList,
+ * and calls the specified destroy function on every element's data.
  *
  * Since: 2.28
- **/
+ */
 void
 g_slist_free_full (GSList         *list,
-		   GDestroyNotify  free_func)
+                   GDestroyNotify  free_func)
 {
-  g_slist_foreach (list, (GFunc) free_func, NULL);
-  g_slist_free (list);
+  while (list)
+    {
+      GSList *next = list->next;
+      (*free_func) (list->data);
+      _g_slist_free1 (list);
+      list = next;
+    }
 }
 
 /**