[PATCH] raid kdev_t cleanups (part 1)

[PATCH] raid kdev_t cleanups (part 1)

	* ->error_handler() switched to struct block_device *.
	* md_sync_acct() switched to struct block_device *.
	* raid5 struct disk_info ->dev is gone - we use ->bdev everywhere.
	* bunch of kdev_same() when we have corresponding struct block_device *
and can simply compare them is removed from drivers/md/*.c