nvdimm/btt: do not call del_gendisk() if not needed

del_gendisk() should not called if the disk has not been added. Fix this.

Fixes: 41cd8b7 ("libnvdimm, btt: add support for blk integrity")
Reviewed-by: Dan Williams <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: mcgrof

drivers/nvdimm/btt.c

@@ -1537,7 +1537,6 @@ static int btt_blk_init(struct btt *btt)
 		int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
 
 		if (rc) {
-			del_gendisk(btt->btt_disk);
 			blk_cleanup_disk(btt->btt_disk);
 			return rc;
 		}