[yelp] [libyelp/yelp-view] Set back_cur to NULL in dispose to prevent crash

[Shaun McCance <shaunm src gnome org>]

commit fc29ddafd8c9d1abc3e1f46ed91248b0bc9baecd
Author: Shaun McCance <shaunm gnome org>
Date:   Wed May 19 17:22:08 2010 -0500

    [libyelp/yelp-view] Set back_cur to NULL in dispose to prevent crash

 libyelp/yelp-view.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libyelp/yelp-view.c b/libyelp/yelp-view.c
index d5f00c8..0389c39 100644
--- a/libyelp/yelp-view.c
+++ b/libyelp/yelp-view.c
@@ -282,6 +282,7 @@ yelp_view_dispose (GObject *object)
         priv->document = NULL;
     }
 
+    priv->back_cur = NULL;
     while (priv->back_list) {
         back_entry_free ((YelpBackEntry *) priv->back_list->data);
         priv->back_list = g_list_delete_link (priv->back_list, priv->back_list);
@@ -609,7 +610,7 @@ view_scrolled (GtkAdjustment *adjustment,
                YelpView      *view)
 {
     YelpViewPrivate *priv = GET_PRIV (view);
-    if (priv->back_cur == NULL)
+    if (priv->back_cur == NULL || priv->back_cur->data == NULL)
         return;
     if (adjustment == priv->vadjustment)
         ((YelpBackEntry *) priv->back_cur->data)->vadj = gtk_adjustment_get_value (adjustment);