netfilter: nf_tables: Remove ununsed function nft_data_debug

It is never used, so can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -148,13 +148,6 @@ static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
 	memcpy(dst, src, len);
 }
 
-static inline void nft_data_debug(const struct nft_data *data)
-{
-	pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
-		 data->data[0], data->data[1],
-		 data->data[2], data->data[3]);
-}
-
 /**
  *	struct nft_ctx - nf_tables rule/set context
  *