inet6: Clean up failure path in do_ipv6_setsockopt().

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2160516
Tested: compile only

Conflicts:
  - context difference due to missing commit 0f95f7d from
    upstream.

commit b45a337
Author: Kuniyuki Iwashima <kuniyu@amazon.com>
Date:   Wed Oct 19 15:36:03 2022 -0700

    inet6: Clean up failure path in do_ipv6_setsockopt().

    We can reuse the unlock label above and need not repeat the same code.

    Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Xin Long <lxin@redhat.com>

Author: Xin Long

net/ipv6/ipv6_sockglue.c

@@ -989,10 +989,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	return retv;
 
 e_inval:
-	release_sock(sk);
-	if (needs_rtnl)
-		rtnl_unlock();
-	return -EINVAL;
+	retv = -EINVAL;
+	goto unlock;
 }
 
 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,