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.

htlcswitch/payment_result_test.go

@@ -100,6 +100,10 @@ func TestNetworkResultStore(t *testing.T) {
 	const numResults = 4
 
 	tempDir, err := ioutil.TempDir("", "testdb")
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	db, err := channeldb.Open(tempDir)
 	if err != nil {
 		t.Fatal(err)