update keepalive code.

Author: blacknon

connect.go

@@ -203,11 +203,11 @@ func (c *Connect) SendKeepAlive(session *ssh.Session) {
 			if _, err := session.SendRequest("[email protected]", true, nil); err != nil {
 				if !errors.Is(err, io.EOF) {
 					log.Println("Failed to send keepalive packet:", err)
-					return
 				} else {
 					// err is io.EOF
 					log.Println("Session io.EOF. exit keepalive.")
 				}
+				return
 			} else {
 				// err is nil.
 				time.Sleep(time.Duration(interval) * time.Second)