Kir Kolyshkin 8d9dcc467b unix: modernize test helpers
Test helper functions mktmpfifo and chtmpdir were written
before t.Cleanup was available, which necessitated returning
of a cleanup function and the use of defer.

Let's use t.Cleanup (available since Go 1.14) and simplify the callers.

While at it,
 - use t.Helper (added in Go 1.9);
 - simplify some error messages (errors that come from os package
   usually doesn't need to be wrapped).

Change-Id: Id981ae1c85fa2642a76358a31fc18a9af2f78711
Reviewed-on: https://go-review.googlesource.com/c/sys/+/526695
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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sys

Go Reference

This repository holds supplemental Go packages for low-level interactions with the operating system.

Download/Install

The easiest way to install is to run go get -u golang.org/x/sys. You can also manually git clone the repository to $GOPATH/src/golang.org/x/sys.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the sys repository is located at https://github.com/golang/go/issues. Prefix your issue with "x/sys:" in the subject line, so it is easy to find.

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