[Chapel Merge] Update err_t usage in these two tests

Branch: refs/heads/main
Revision: be2f9aa
Author: bradcray
Link: Update err_t usage in these two tests by bradcray · Pull Request #19760 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #19760 from bradcray/fix-qio-err-t-tests

Update err_t usage in these two tests

[trivial, not reviewed]

I regret to say that I'd forgotten that I hadn't run a full test
on this after developing it due to too much time passing between
writing the PR and merging it. Sorry to have missed these.

Modified Files:
M test/io/ferguson/ctests/qio_pwriteread.test.c

M test/users/ferguson/err_tmp.chpl

Compare: https://github.com/chapel-lang/chapel/compare/aaa52a7fcdbf...be2f9aa65573