tcp: simplify _bpf_setsockopt(): Remove flags argument

Now that the previous patches have removed the code that uses the
flags argument to _bpf_setsockopt(), we can remove that argument.
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Kevin Yang <yyd@google.com>
Cc: Lawrence Brakmo <brakmo@fb.com>

net/core/filter.c

@@ -4314,7 +4314,7 @@ static const struct bpf_func_proto bpf_get_socket_uid_proto = {
 };
 
 static int _bpf_setsockopt(struct sock *sk, int level, int optname,
-			   char *optval, int optlen, u32 flags)
+			   char *optval, int optlen)
 {
 	char devname[IFNAMSIZ];
 	int val, valbool;
@@ -4611,9 +4611,7 @@ static int _bpf_getsockopt(struct sock *sk, int level, int optname,
 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx,
 	   int, level, int, optname, char *, optval, int, optlen)
 {
-	u32 flags = 0;
-	return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen,
-			       flags);
+	return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen);
 }
 
 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = {
@@ -4647,9 +4645,7 @@ static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = {
 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
 	   int, level, int, optname, char *, optval, int, optlen)
 {
-	u32 flags = 0;
-	return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen,
-			       flags);
+	return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen);
 }
 
 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = {