Simplify printedDigits usage.
Simplify printedDigits usage.

Within this control flow:

```
if (printedDigits != 0) {
  // ...
} else if (digits != 0) {
```

we're guaranteed `printedDigits == 0`, so the following code
can be slightly simplified.

ulfjack/ryu,ulfjack/ryu,ulfjack/ryu,ulfjack/ryu