multi: remove dead code

invoices/invoiceregistry.go

@@ -27,10 +27,6 @@ var (
 
 	// errNoUpdate is returned when no invoice updated is required.
 	errNoUpdate = errors.New("no update needed")
-
-	// errReplayedHtlc is returned if the htlc is already recorded on the
-	// invoice.
-	errReplayedHtlc = errors.New("replayed htlc")
 )
 
 // HodlEvent describes how an htlc should be resolved. If HodlEvent.Preimage is

invoices/invoiceregistry_test.go

@@ -23,8 +23,6 @@ var (
 
 	testHtlcExpiry = uint32(5)
 
-	testInvoiceCltvDelta = uint32(4)
-
 	testFinalCltvRejectDelta = int32(4)
 
 	testCurrentHeight = int32(1)