Missing the nla_policy description will also miss the validation check
in kernel.
Fixes: 70ca767ea1b2 ("netfilter: nft_hash: Add hash offset value")
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
        [NFTA_HASH_LEN]         = { .type = NLA_U32 },
        [NFTA_HASH_MODULUS]     = { .type = NLA_U32 },
        [NFTA_HASH_SEED]        = { .type = NLA_U32 },
+       [NFTA_HASH_OFFSET]      = { .type = NLA_U32 },
 };
 
 static int nft_hash_init(const struct nft_ctx *ctx,