Changing expected status response for Logout call

ftp.go

@@ -437,7 +437,7 @@ func (c *ServerConn) NoOp() error {
 
 // Logout issues a REIN FTP command to logout the current user.
 func (c *ServerConn) Logout() error {
-	_, _, err := c.cmd(StatusLoggedIn, "REIN")
+	_, _, err := c.cmd(StatusReady, "REIN")
 	return err
 }