netfilter: conntrack: get rid of double sizeof

sizeof(sizeof()) is quite strange and does not seem to be what
is wanted here.

The issue is detected with the help of Coccinelle.

Fixes: 39215846 ("netfilter: conntrack: remove nlattr_size pointer from l4proto trackers")
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_conntrack_proto_tcp.c

@@ -1213,8 +1213,8 @@ static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = {
 #define TCP_NLATTR_SIZE	( \
 	NLA_ALIGN(NLA_HDRLEN + 1) + \
 	NLA_ALIGN(NLA_HDRLEN + 1) + \
-	NLA_ALIGN(NLA_HDRLEN + sizeof(sizeof(struct nf_ct_tcp_flags))) + \
-	NLA_ALIGN(NLA_HDRLEN + sizeof(sizeof(struct nf_ct_tcp_flags))))
+	NLA_ALIGN(NLA_HDRLEN + sizeof(struct nf_ct_tcp_flags)) + \
+	NLA_ALIGN(NLA_HDRLEN + sizeof(struct nf_ct_tcp_flags)))
 
 static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
 {