nvdimm/btt: use goto error labels on btt_blk_init()

This will make it easier to share common error paths.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20211103230437.1639990-2-mcgrof@kernel.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvdimm/btt.c

@@ -1519,6 +1519,7 @@ static int btt_blk_init(struct btt *btt)
 {
 	struct nd_btt *nd_btt = btt->nd_btt;
 	struct nd_namespace_common *ndns = nd_btt->ndns;
+	int rc = -ENOMEM;
 
 	btt->btt_disk = blk_alloc_disk(NUMA_NO_NODE);
 	if (!btt->btt_disk)
@@ -1534,19 +1535,22 @@ static int btt_blk_init(struct btt *btt)
 	blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_disk->queue);
 
 	if (btt_meta_size(btt)) {
-		int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
-
-		if (rc) {
-			blk_cleanup_disk(btt->btt_disk);
-			return rc;
-		}
+		rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
+		if (rc)
+			goto out_cleanup_disk;
 	}
+
 	set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
 	device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL);
+
 	btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
 	nvdimm_check_and_set_ro(btt->btt_disk);
 
 	return 0;
+
+out_cleanup_disk:
+	blk_cleanup_disk(btt->btt_disk);
+	return rc;
 }
 
 static void btt_blk_cleanup(struct btt *btt)