[PATCH 3/3] testsuite: Update tests for 'xfclose' use

[Maciej W. Rozycki]

On Mon, 25 Aug 2025, Florian Weimer wrote:

> > Convert (some) tests to use 'xfclose' rather than using plain 'fclose' 
> > call with no error checking or plain missing such a call.
> 
> Okay.

 And this is now in too, thanks for your review.

  Maciej