[glom/spread-table] Fix previous commit.

[Murray Cumming <murrayc src gnome org>]

commit 0517982a5a97d7fd0212494d93c86bcc371fcfb3
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Nov 8 15:05:32 2010 +0100

    Fix previous commit.

 .../eggspreadtable/eggspreadtable.c                |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glom/utility_widgets/eggspreadtable/eggspreadtable.c b/glom/utility_widgets/eggspreadtable/eggspreadtable.c
index 61556c9..3ee48db 100644
--- a/glom/utility_widgets/eggspreadtable/eggspreadtable.c
+++ b/glom/utility_widgets/eggspreadtable/eggspreadtable.c
@@ -873,7 +873,7 @@ egg_spread_table_forall (GtkContainer *container,
    */
   for (list = g_list_copy(priv->children); list; list = list->next)
   {
-    (* callback) (widget, callback_data);
+    (* callback) ((GtkWidget*) list->data, callback_data);
   }
 
   g_list_free(list);