Fix migration for ide devices

commit 93c8cfd9e6
Author: Gleb Natapov <gleb@redhat.com>
Date:   Sun Aug 2 11:36:47 2009 +0300

    make windows notice media change

Broke save/restore by loading a new field but not saving it.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/ide.c

@@ -2888,6 +2888,7 @@ static void ide_save(QEMUFile* f, IDEState *s)
 
     qemu_put_8s(f, &s->sense_key);
     qemu_put_8s(f, &s->asc);
+    qemu_put_8s(f, &s->cdrom_changed);
     /* XXX: if a transfer is pending, we do not save it yet */
 }