all: use reflect.TypeFor now available in Go 1.22 (#11078)

Updates #cleanup

Signed-off-by: Joe Tsai <joetsai@digital-static.net>

control/controlclient/controlclient_test.go

@@ -20,7 +20,7 @@ func fieldsOf(t reflect.Type) (fields []string) {
 func TestStatusEqual(t *testing.T) {
 	// Verify that the Equal method stays in sync with reality
 	equalHandles := []string{"Err", "URL", "NetMap", "Persist", "state"}
-	if have := fieldsOf(reflect.TypeOf(Status{})); !reflect.DeepEqual(have, equalHandles) {
+	if have := fieldsOf(reflect.TypeFor[Status]()); !reflect.DeepEqual(have, equalHandles) {
 		t.Errorf("Status.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
 			have, equalHandles)
 	}

control/controlclient/map.go

@@ -538,7 +538,7 @@ var nodeFields = sync.OnceValue(getNodeFields)
 
 // getNodeFields returns the fails of tailcfg.Node.
 func getNodeFields() []string {
-	rt := reflect.TypeOf((*tailcfg.Node)(nil)).Elem()
+	rt := reflect.TypeFor[tailcfg.Node]()
 	ret := make([]string, rt.NumField())
 	for i := 0; i < rt.NumField(); i++ {
 		ret[i] = rt.Field(i).Name

control/controlknobs/controlknobs_test.go

@@ -15,7 +15,7 @@ func TestAsDebugJSON(t *testing.T) {
 	}
 	k := new(Knobs)
 	got := k.AsDebugJSON()
-	if want := reflect.TypeOf(Knobs{}).NumField(); len(got) != want {
+	if want := reflect.TypeFor[Knobs]().NumField(); len(got) != want {
 		t.Errorf("AsDebugJSON map has %d fields; want %v", len(got), want)
 	}
 }