pd: add error handling support for add_disk()

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/paride/pd.c

@@ -938,8 +938,12 @@ static int pd_probe_drive(struct pd_unit *disk, int autoprobe, int port,
 	if (ret)
 		goto put_disk;
 	set_capacity(disk->gd, disk->capacity);
-	add_disk(disk->gd);
+	ret = add_disk(disk->gd);
+	if (ret)
+		goto cleanup_disk;
 	return 0;
+cleanup_disk:
+	blk_cleanup_disk(disk->gd);
 put_disk:
 	put_disk(p);
 	disk->gd = NULL;