net: Remove unused flags argument from do_ipv6_getsockopt

The 'unsigned int flags' argument is always 0, so it can be removed.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002840.2891763-1-kafai@fb.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

net/ipv6/ipv6_sockglue.c

@@ -1133,7 +1133,7 @@ static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
 }
 
 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, int __user *optlen, unsigned int flags)
+		    char __user *optval, int __user *optlen)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	int len;
@@ -1168,7 +1168,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 
 		msg.msg_control_user = optval;
 		msg.msg_controllen = len;
-		msg.msg_flags = flags;
+		msg.msg_flags = 0;
 		msg.msg_control_is_user = true;
 
 		lock_sock(sk);
@@ -1492,7 +1492,7 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
+	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {