Commit "db91ff55bdf06736b" using curr_resync_completed instead of curr_resync when interrupted the resync operation

[majianpeng <majianpeng@xxxxxxxxx>]

Hi Neil,
>commit db91ff55bdf06736b849afc1b1fce5763bbb8d5d
>    1/ If a resync is aborted we should record how far we got
>     (recovery_cp) the last request that we know has completed
>     (->curr_resync_completed) rather than the last request that was
>     submitted (->curr_resync).
If resync operation interrupted,it will call:
>	wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
So the curr_resync must be complete. Using curr_resync is safe.
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