master node can not be recovered

[Bean Huo 霍斌斌 (beanhuo)]

Hi, Richard 
I tested my UBI power loss solution, have a question about master node.
We all know that if master node be corrupted by power loss , we can recover it by second one. But from my testing results, in fact,
It cannot be recovered by second backup master node. If first master node be corrupted by power loss, this relevant block will be correctly read, get_master_node will not reture 0, so next time recover operation will not run.
Or I'm wrong?

Best Regards!

BeanHuo