netfilter: xt_osf: fix xt_osf_remove_callback() return value

Return a negative error value.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/netfilter/xt_osf.c

@@ -118,7 +118,7 @@ static int xt_osf_remove_callback(struct sock *ctnl, struct sk_buff *skb,
 {
 	struct xt_osf_user_finger *f;
 	struct xt_osf_finger *sf;
-	int err = ENOENT;
+	int err = -ENOENT;
 
 	if (!osf_attrs[OSF_ATTR_FINGER])
 		return -EINVAL;