internal/godebug: check error from os.ReadFile in test
Change-Id: I4770443c8eaa12add2e04cbf9d18ebfbbd851162
Reviewed-on: https://go-review.googlesource.com/c/go/+/643259 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
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