--- zzzz-none-000/linux-2.6.39.4/drivers/isdn/mISDN/socket.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/isdn/mISDN/socket.c	2021-11-10 13:38:15.000000000 +0000
@@ -452,7 +452,8 @@
 	char __user *optval, int __user *optlen)
 {
 	struct sock *sk = sock->sk;
-	int len, opt;
+	int len __maybe_unused;
+	int opt;
 
 	if (get_user(len, optlen))
 		return -EFAULT;