[PATCH 2/3] testsuite: Update tests for 'xfmemopen' use

[Florian Weimer]

* Maciej W. Rozycki:

> From: Maciej W. Rozycki <macro@redhat.com>
>
> Convert tests to use 'xfmemopen' rather than open-coding error checks 
> with 'fmemopen' or plain missing them, where 'fmemopen' itself is not 
> the scope of testing.  Leave 'fmemopen' tests alone.

Looks okay.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian