Fix probe single path check.

Author: tnull

lightning/src/ln/channelmanager.rs

@@ -2744,15 +2744,9 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 
 		let payment_hash = PaymentHash(Sha256::hash(&preimage).into_inner());
 
-		if let Some(params) = &route.payment_params {
-			if params.max_path_count != 1 {
-				return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
-					err: "Probe payments need to be sent over a single path".to_string()
-				}))
-			}
-		} else {
+		if route.paths.len() > 1 {
 			return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
-				err: "No parameters provided".to_string()
+				err: "Probe payments need to be sent over a single path".to_string()
 			}))
 		}