error: format not a string literal and no format arguments 

```
../../ukui-greeter/greeter/loginwindow.cpp:587:12: error: format not a string literal and no format arguments [-Werror=format-security]
  587 |     sprintf(str,_(ch));
      |     ~~~~~~~^~~~~~~~~~~
```

it popped error, I found https://stackoverflow.com/questions/9707569/c-array-warning-format-not-a-string-literal, but not sure if it is relevant. 