netfilter: nft_immediate: drop chain reference counter on error

In the init path, nft_data_init() bumps the chain reference counter,
decrement it on error by following the error path which calls
nft_data_release() to restore it.

Fixes: 4bedf9ee ("netfilter: nf_tables: fix chain binding transaction logic")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_immediate.c

@@ -78,7 +78,7 @@ static int nft_immediate_init(const struct nft_ctx *ctx,
 		case NFT_GOTO:
 			err = nf_tables_bind_chain(ctx, chain);
 			if (err < 0)
-				return err;
+				goto err1;
 			break;
 		default:
 			break;