pcd: capture errors on cdrom_register()

No errors were being captured wehen cdrom_register() fails,
capture the error and return the error.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/paride/pcd.c

@@ -940,7 +940,9 @@ static int pcd_init_unit(struct pcd_unit *cd, bool autoprobe, int port,
 
 	cd->present = 1;
 	pcd_probe_capabilities(cd);
-	register_cdrom(cd->disk, &cd->info);
+	ret = register_cdrom(cd->disk, &cd->info);
+	if (ret)
+		goto out_pi_release;
 	ret = add_disk(cd->disk);
 	if (ret)
 		goto out_unreg_cdrom;