f var length onion message packet

lightning/src/ln/onion_utils.rs

@@ -542,7 +542,7 @@ pub(crate) enum MessagePayload {
 		/// HMAC of the next hop's onion packet.
 		next_hop_hmac: [u8; 32],
 		/// Bytes of the onion packet we're forwarding.
-		new_packet_bytes: [u8; 20*65],
+		new_packet_bytes: Vec<u8>,
 	},
 }