Revert "Convert atexit users to exit_notifier"

This reverts commit d7234f4d7e373a708e1df9ab565a71b71b189025.

Conflicts:

	hw/xen_machine_pv.c

This should have never been committed.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/xen_machine_pv.c b/hw/xen_machine_pv.c
index fe7d35c..162f88d 100644
--- a/hw/xen_machine_pv.c
+++ b/hw/xen_machine_pv.c
@@ -42,7 +42,6 @@
     CPUState *env;
     DriveInfo *dinfo;
     int i;
-    static Notifier exit_notifier = { .notify = xen_config_cleanup };
 
     /* Initialize a dummy CPU */
     if (cpu_model == NULL) {
@@ -106,7 +105,7 @@
     }
 
     /* config cleanup hook */
-    exit_notifier_add(&exit_notifier);
+    atexit(xen_config_cleanup);
 
     /* setup framebuffer */
     xen_init_display(xen_domid);