Code cleanup and refactoring

Signed-off-by: PingWang <[email protected]>

Author: ping035627

cmd/kubeadm/app/preflight/checks.go

@@ -1070,7 +1070,7 @@ func RunChecks(checks []Checker, ww io.Writer, ignorePreflightErrors sets.String
 		Name   string
 		Errors []error
 	}
-	found := []checkErrors{}
+	var errsBuffer bytes.Buffer
 
 	for _, c := range checks {
 		name := c.Name()
@@ -1085,18 +1085,12 @@ func RunChecks(checks []Checker, ww io.Writer, ignorePreflightErrors sets.String
 		for _, w := range warnings {
 			io.WriteString(ww, fmt.Sprintf("\t[WARNING %s]: %v\n", name, w))
 		}
-		if len(errs) > 0 {
-			found = append(found, checkErrors{Name: name, Errors: errs})
+		for _, i := range errs {
+			errsBuffer.WriteString(fmt.Sprintf("\t[ERROR %s]: %v\n", name, i.Error()))
 		}
 	}
-	if len(found) > 0 {
-		var errs bytes.Buffer
-		for _, c := range found {
-			for _, i := range c.Errors {
-				errs.WriteString(fmt.Sprintf("\t[ERROR %s]: %v\n", c.Name, i.Error()))
-			}
-		}
-		return &Error{Msg: errs.String()}
+	if errsBuffer.Len() > 0 {
+		return &Error{Msg: errsBuffer.String()}
 	}
 	return nil
 }