os: convert poll.ErrFileClosed to ErrClosed for Stat
Fixes #66665
Change-Id: I3e3b7433d245daa997d7d502c2ef8978af6664fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/576119
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Robert Griesemer <gri@google.com>