qed: add migration blocker (v2)

Now when you try to migrate with qed, you get:

(qemu) migrate tcp:localhost:1025
Block format 'qed' used by device 'ide0-hd0' does not support feature 'live migration'
(qemu)

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

1 files changed, 2 insertions, 0 deletions

diff --git a/block/qed.h b/block/qed.h
index 388fdb3760..62cbd3b899 100644
--- a/block/qed.h
+++ b/block/qed.h
@@ -164,6 +164,8 @@ typedef struct {
 
     /* Periodic flush and clear need check flag */
     QEMUTimer *need_check_timer;
+
+    Error *migration_blocker;
 } BDRVQEDState;
 
 enum {