htlcswitch: remove Switch reference from channelLink

htlcswitch/switch_test.go

@@ -5263,10 +5263,12 @@ func testSwitchHandlePacketForward(t *testing.T, zeroConf, private,
 	t.Parallel()
 
 	// Create a link for Alice that we'll add to the switch.
-	aliceLink, _, _, _, _, err :=
+	harness, err :=
 		newSingleLinkTestHarness(t, btcutil.SatoshiPerBitcoin, 0)
 	require.NoError(t, err)
 
+	aliceLink := harness.aliceLink
+
 	s, err := initSwitchWithTempDB(t, testStartingHeight)
 	if err != nil {
 		t.Fatalf("unable to init switch: %v", err)