diff --git a/src/common/tools/hosts.go b/src/common/tools/hosts.go
index 4315ccfc87c48be81e14a9a9f807233d229893d9..e7600ec9dab32a0c6206264f2d28764e1d5d9b3c 100644
--- a/src/common/tools/hosts.go
+++ b/src/common/tools/hosts.go
@@ -28,8 +28,7 @@ func HostsToJson() (data map[string][]string, err error) {
 			data[key] = append(data[key], s.Text())
 		}
 	}
-	err = s.Err()
-	if err != nil {
+	if s.Err() != nil {
 		return nil, err
 	}
 	return data, nil
@@ -46,7 +45,6 @@ func MapToSaveHosts(data map[string][]string) error {
 		if err != nil {
 			return err
 		}
-
 		_, err = f.Write([]byte(strings.Join(v, "\n")))
 		if err != nil {
 			return err