Re: [PATCH v1] PQputCopyEnd never returns 0, fix the inaccurate comment

Hi Junwang,

> PQputCopyEnd returns 1 or -1, never 0, I guess the comment was
> copy/paste from PQputCopyData's comment, this should be fixed.

The patch LGTM but I wonder whether we should also change all the
existing calls of PQputCopyEnd() from:

```
PQputCopyEnd(...) <= 0
```

... to:

```
PQputCopyEnd(...) < 0
```

Given the circumstances, checking for equality to zero seems to be at
least strange.

On top of that, none of the PQputCopyData() callers cares whether the
function returns 0 or -1, both are treated the same way. I suspect the
function does some extra work no one asked to do and no one cares
about. Perhaps this function should be refactored too for consistency.

Thoughts?

--
Best regards,
Aleksander Alekseev