cmd/go/internal/modfetch: stop cutting the last character of versions

When a zip archive for a module contains an unexpected file, the error
message removes the last character in the version number, e.g. an invalid
archive for "somemod@v1.2.3" would generate the following error:
"zip for somemod@1.2. has unexpected file..."

Change-Id: I366622df16a71fa7467a4bc62cb696e3e83a2942
GitHub-Last-Rev: f172283bcdffd45b485b1e8fd99795eb93fef726
GitHub-Pull-Request: golang/go#27279
Reviewed-on: https://go-review.googlesource.com/131635
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
1 file changed
tree: 25bd86b5fbefe00195686a6c9fb1dcf050c4fc33
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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