routing: Fix dropped errors in tests.

lnd: Fix dropped errors in tests.

contractcourt: Fix dropped errors in tests.

htlcswitch: Fix dropped errors in tests.

invoices: Fix dropped error in tests.

lnwallet: Fix dropped errors in tests.

macaroons: Fix dropped error in tests.

invoices/invoiceregistry_test.go

@@ -329,6 +329,9 @@ func TestHoldInvoice(t *testing.T) {
 	defer timeout(t)()
 
 	cdb, cleanup, err := newDB()
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer cleanup()
 
 	// Instantiate and start the invoice registry.