Add missing keysend preimage check on inbound onion read.

Author: valentinewallace

lightning/src/ln/msgs.rs

@@ -2362,7 +2362,9 @@ impl<NS: Deref> ReadableArgs<(Option<PublicKey>, &NS)> for InboundOnionPayload w
 		}
 
 		if let Some(blinding_point) = intro_node_blinding_point.or(update_add_blinding_point) {
-			if short_id.is_some() || payment_data.is_some() || payment_metadata.is_some() {
+			if short_id.is_some() || payment_data.is_some() || payment_metadata.is_some() ||
+				keysend_preimage.is_some()
+			{
 				return Err(DecodeError::InvalidValue)
 			}
 			let enc_tlvs = encrypted_tlvs_opt.ok_or(DecodeError::InvalidValue)?.0;