[XFRM] policy: Replace magic number with XFRM_POLICY_OUT

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/xfrm_policy.c

@@ -1477,7 +1477,7 @@ int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
 	pol_dead = 0;
 	xfrm_nr = 0;
 
-	if (sk && sk->sk_policy[1]) {
+	if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
 		policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
 		if (IS_ERR(policy))
 			return PTR_ERR(policy);