fixup! sphinx_test: add test for blinded route processing

Author: gijswijs

path_test.go

@@ -401,7 +401,8 @@ func TestOnionMessageRouteBlinding(t *testing.T) {
 	// peelOnion is a helper closure that can be used to set up a Router
 	// and use it to process the given onion packet.
 	peelOnion := func(key *btcec.PrivateKey,
-		blindingPoint *btcec.PublicKey) *ProcessedPacket {
+		blindingPoint *btcec.PublicKey,
+		onionPacket *OnionPacket) *ProcessedPacket {
 
 		r := NewRouter(&PrivKeyECDH{PrivKey: key}, NewMemoryReplayLog())
 
@@ -469,7 +470,9 @@ func TestOnionMessageRouteBlinding(t *testing.T) {
 		// functional option WithBlindingPoint) and we expect that the
 		// onion message packet for this hop is processed without error,
 		// otherwise peelOnion fails the test.
-		processedPkt := peelOnion(priv, blindingPoint)
+		processedPkt := peelOnion(
+			priv, blindingPoint, currentOnionPacket,
+		)
 
 		// We derive the next blinding point from the current blinding
 		// point and the private key of the current hop. The new