[evolution] Work around another a11y crash.

[Matthew Barnes <mbarnes src gnome org>]

commit 27908060c3b2c319f582f02079406859668eb005
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Apr 13 12:20:48 2011 -0400

    Work around another a11y crash.
    
    Some kind of object lifetime issue in GalA11yETableItem.  Just work
    around it for now.  Killing this class would pretty much mean killing
    a11y support for ETables entirely and I'm not that pissed off... yet.

 widgets/table/gal-a11y-e-table-item.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/widgets/table/gal-a11y-e-table-item.c b/widgets/table/gal-a11y-e-table-item.c
index eb0c9be..f35eeb1 100644
--- a/widgets/table/gal-a11y-e-table-item.c
+++ b/widgets/table/gal-a11y-e-table-item.c
@@ -71,8 +71,16 @@ static AtkObject* eti_ref_at (AtkTable *table, gint row, gint column);
 static void
 item_finalized (gpointer user_data, GObject *gone_item)
 {
-	GalA11yETableItem *a11y = GAL_A11Y_E_TABLE_ITEM (user_data);
-	GalA11yETableItemPrivate *priv = GET_PRIVATE (a11y);
+	GalA11yETableItem *a11y;
+	GalA11yETableItemPrivate *priv;
+
+	/* XXX GalA11yETableItem may already be finalized.
+	 *     Just work around it for now. */
+	if (!GAL_A11Y_IS_E_TABLE_ITEM (user_data))
+		return;
+
+	a11y = GAL_A11Y_E_TABLE_ITEM (user_data);
+	priv = GET_PRIVATE (a11y);
 
 	atk_state_set_add_state (priv->state_set, ATK_STATE_DEFUNCT);
 	atk_object_notify_state_change (ATK_OBJECT (a11y), ATK_STATE_DEFUNCT, TRUE);