[PATCH] NVMe: nvme_core_exit() should do cleanup in the reverse order as nvme_core_init does

[Christoph Hellwig]

On Thu, Apr 28, 2016 at 04:19:31PM +0800, Wang Sheng-Hui wrote:
> nvme_core_init does:
>     1) register_blkdev
>     2) __register_chrdev
>     3) class_create
> 
> nvme_core_exit should do cleanup in the reverse order.

Not sure why this would matter, but it looks correct to me:

Reviewed-by: Christoph Hellwig <hch at lst.de>