style: Address warnings

[coveralls]

Pull Request Test Coverage Report for Build 8925415997

Details

• 2 of 6 (33.33%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 43.557%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/fmt/writer/mod.rs	1	2	50.0%
src/fmt/writer/buffer.rs	0	3	0.0%
<!--	Total:	2	6	33.33%	-->

Files with Coverage Reduction	New Missed Lines	%
src/fmt/writer/mod.rs	1	59.62%
<!--	Total:	1		-->

Totals
Change from base Build 8715540011:	0.0%
Covered Lines:	240
Relevant Lines:	551

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💛 - Coveralls