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/test_utils.go

@@ -264,12 +264,20 @@ func createTestChannel(alicePrivKey, bobPrivKey []byte,
 	}
 
 	alicePath, err := ioutil.TempDir("", "alicedb")
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
 	dbAlice, err := channeldb.Open(alicePath)
 	if err != nil {
 		return nil, nil, nil, err
 	}
 
 	bobPath, err := ioutil.TempDir("", "bobdb")
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
 	dbBob, err := channeldb.Open(bobPath)
 	if err != nil {
 		return nil, nil, nil, err