[at-spi2-atk] Add NULL check to fix crash when receiving a dbus reply after cleanup

[Mike Gorse <mgorse src gnome org>]

commit 5de2b2bc9c83045a6870e13cd20bc3c2c0a1121f
Author: Mike Gorse <mgorse suse com>
Date:   Wed Apr 10 12:40:47 2013 -0500

    Add NULL check to fix crash when receiving a dbus reply after cleanup

 atk-adaptor/bridge.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/atk-adaptor/bridge.c b/atk-adaptor/bridge.c
index 9683e18..b016da6 100644
--- a/atk-adaptor/bridge.c
+++ b/atk-adaptor/bridge.c
@@ -88,6 +88,9 @@ tally_event_reply ()
 {
   static int replies_received = 0;
 
+  if (!spi_global_app_data)
+    return;
+
   replies_received++;
   if (replies_received == 3)
   {