Pass bytes instead of TlvStream to verify

Passing bytes directly to InvoiceContents::verify improves readability
as then a TlvStream for each TLV record range can be created from the
bytes instead of needing to clone the TlvStream upfront. In an upcoming
commit, the experimental TLV record range will utilize this.

Author: jkczyz

lightning/src/offers/invoice.rs

@@ -868,7 +868,7 @@ impl Bolt12Invoice {
 				(&refund.payer.0, REFUND_IV_BYTES_WITH_METADATA)
 			},
 		};
-		self.contents.verify(TlvStream::new(&self.bytes), metadata, key, iv_bytes, secp_ctx)
+		self.contents.verify(&self.bytes, metadata, key, iv_bytes, secp_ctx)
 	}
 
 	/// Verifies that the invoice was for a request or refund created using the given key by
@@ -882,7 +882,8 @@ impl Bolt12Invoice {
 			InvoiceContents::ForOffer { .. } => INVOICE_REQUEST_IV_BYTES,
 			InvoiceContents::ForRefund { .. } => REFUND_IV_BYTES_WITHOUT_METADATA,
 		};
-		self.contents.verify(TlvStream::new(&self.bytes), &metadata, key, iv_bytes, secp_ctx)
+		self.contents
+			.verify(&self.bytes, &metadata, key, iv_bytes, secp_ctx)
 			.and_then(|extracted_payment_id| (payment_id == extracted_payment_id)
 				.then(|| payment_id)
 				.ok_or(())
@@ -1133,11 +1134,11 @@ impl InvoiceContents {
 	}
 
 	fn verify<T: secp256k1::Signing>(
-		&self, tlv_stream: TlvStream<'_>, metadata: &Metadata, key: &ExpandedKey,
-		iv_bytes: &[u8; IV_LEN], secp_ctx: &Secp256k1<T>
+		&self, bytes: &[u8], metadata: &Metadata, key: &ExpandedKey, iv_bytes: &[u8; IV_LEN],
+		secp_ctx: &Secp256k1<T>
 	) -> Result<PaymentId, ()> {
-		let offer_records = tlv_stream.clone().range(OFFER_TYPES);
-		let invreq_records = tlv_stream.range(INVOICE_REQUEST_TYPES).filter(|record| {
+		let offer_records = TlvStream::new(bytes).range(OFFER_TYPES);
+		let invreq_records = TlvStream::new(bytes).range(INVOICE_REQUEST_TYPES).filter(|record| {
 			match record.r#type {
 				PAYER_METADATA_TYPE => false, // Should be outside range
 				INVOICE_REQUEST_PAYER_ID_TYPE => !metadata.derives_payer_keys(),