netfilter: nf_tables: fix percpu memory leak at nf_tables_addchain()

netfilter: nf_tables: fix percpu memory leak at nf_tables_addchain()

[ Upstream commit 9a4d6dd554b86e65581ef6b6638a39ae079b17ac ]

It seems to me that percpu memory for chain stats started leaking since
commit 3bc158f8d0330f0a ("netfilter: nf_tables: map basechain priority to
hardware priority") when nft_chain_offload_priority() returned an error.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 3bc158f8d0330f0a ("netfilter: nf_tables: map basechain priority to hardware priority")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>