Extend linter rules (#1300)

- dupword checks for duplicate words in the source code
- durationcheck checks for two durations multiplied together
- forbidigo forbids identifiers
- mirror reports wrong mirror patterns of bytes/strings usage
- misspell finds commonly misspelled English words in comments
- predeclared finds code that shadows one of Go's predeclared identifiers
- thelper detects Go test helpers without t.Helper() call and checks the consistency of test helpers

iface/module_linux_test.go

@@ -132,6 +132,7 @@ func resetGlobals() {
 }
 
 func createFiles(t *testing.T) (string, []module) {
+    t.Helper()
 	writeFile := func(path, text string) {
 		if err := os.WriteFile(path, []byte(text), 0644); err != nil {
 			t.Fatal(err)
@@ -167,6 +168,7 @@ func createFiles(t *testing.T) (string, []module) {
 }
 
 func getRandomLoadedModule(t *testing.T) (string, error) {
+    t.Helper()
 	f, err := os.Open("/proc/modules")
 	if err != nil {
 		return "", err