Fix memory leak when dropping locale guard.

[awused]

No description provided.

[otavio]

@awused, could you add an entry on the changes file?

[coveralls]

Pull Request Test Coverage Report for Build 1069917118

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 86.059%

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Files with Coverage Reduction	New Missed Lines	%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-channel-0.3.16/src/mpsc/mod.rs	1	91.78%

Totals
Change from base Build 1067286071:	-0.2%
Covered Lines:	321
Relevant Lines:	373

---

💛 - Coveralls

[otavio]

@awused I've fixed the Windows build error on master. Please rebase this branch and add the fix to the CHANGES.md file so we can merge this.