skd: fix unregister_blkdev() placement

register_blkdev() is called before pci_register_driver() in skd_init()
so unregister_blkdev() should be called after pci_unregister_driver()
in skd_exit(). Fix it.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/block/skd_main.c

@@ -5465,8 +5465,8 @@ static void __exit skd_exit(void)
 {
 	pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID);
 
-	unregister_blkdev(skd_major, DRV_NAME);
 	pci_unregister_driver(&skd_driver);
+	unregister_blkdev(skd_major, DRV_NAME);
 }
 
 module_init(skd_init);