af_ieee802154: setsockopt optlen arg isn't __user

Remove __user annotation from optlen arg as it's bogus.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index 4681501..1319885 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -244,7 +244,7 @@
 }
 
 static int raw_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, int __user optlen)
+		    char __user *optval, int optlen)
 {
 	return -EOPNOTSUPP;
 }