add go simple support

logs/smtp.go

@@ -52,11 +52,7 @@ func newSMTPWriter() Logger {
 //		"level":LevelError
 //	}
 func (s *SMTPWriter) Init(jsonconfig string) error {
-	err := json.Unmarshal([]byte(jsonconfig), s)
-	if err != nil {
-		return err
-	}
-	return nil
+	return json.Unmarshal([]byte(jsonconfig), s)
 }
 
 func (s *SMTPWriter) getSMTPAuth(host string) smtp.Auth {
@@ -116,12 +112,7 @@ func (s *SMTPWriter) sendMail(hostAddressWithPort string, auth smtp.Auth, fromAd
 		return err
 	}
 
-	err = client.Quit()
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return client.Quit()
 }
 
 // WriteMsg write message in smtp writer.