f Use saturating_sub

Author: tnull

src/lib.rs

@@ -989,7 +989,7 @@ impl Node {
 		let payment_id = PaymentId(invoice.payment_hash().into_inner());
 		let payment_hash = PaymentHash((*invoice.payment_hash()).into_inner());
 		let payment_secret = Some(*invoice.payment_secret());
-		let expiry_time = invoice.duration_since_epoch() + invoice.expiry_time();
+		let expiry_time = invoice.duration_since_epoch().saturating_add(invoice.expiry_time());
 		let mut payment_params = PaymentParameters::from_node_id(
 			invoice.recover_payee_pub_key(),
 			invoice.min_final_cltv_expiry_delta() as u32,