md: Fix regression with raid1 arrays without persistent metadata.

A RAID1 which has no persistent metadata, whether internal or
external, will hang on the first write.
This is caused by commit  070dc6dd
In that case, MD_CHANGE_PENDING never gets cleared.

So during md_update_sb, is neither persistent or external,
clear MD_CHANGE_PENDING.

This is suitable for 2.6.36-stable.
Signed-off-by: NNeilBrown <neilb@suse.de>
Cc: stable@kernel.org

drivers/md/md.c

@@ -2108,6 +2108,8 @@ static void md_update_sb(mddev_t * mddev, int force_change)
 	if (!mddev->persistent) {
 		clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
 		clear_bit(MD_CHANGE_DEVS, &mddev->flags);
+		if (!mddev->external)
+			clear_bit(MD_CHANGE_PENDING, &mddev->flags);
 		wake_up(&mddev->sb_wait);
 		return;
 	}