Merge pull request lightningdevkit#2072 from jkczyz/2023-01-fix-scoring-div-by-zero

Fix division by zero in `ProbabilisticScorer`

Author: TheBlueMatt

fuzz/src/router.rs

@@ -17,7 +17,7 @@ use lightning::ln::msgs;
 use lightning::routing::gossip::{NetworkGraph, RoutingFees};
 use lightning::routing::utxo::{UtxoFuture, UtxoLookup, UtxoLookupError, UtxoResult};
 use lightning::routing::router::{find_route, PaymentParameters, RouteHint, RouteHintHop, RouteParameters};
-use lightning::routing::scoring::FixedPenaltyScorer;
+use lightning::routing::scoring::ProbabilisticScorer;
 use lightning::util::config::UserConfig;
 use lightning::util::ser::Readable;
 
@@ -292,7 +292,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 						}]));
 					}
 				}
-				let scorer = FixedPenaltyScorer::with_penalty(0);
+				let scorer = ProbabilisticScorer::new(Default::default(), &net_graph, &logger);
 				let random_seed_bytes: [u8; 32] = [get_slice!(1)[0]; 32];
 				for target in node_pks.iter() {
 					let final_value_msat = slice_to_be64(get_slice!(8));