fix clippy warning #1534

Job	Run time
Wheel on macos-latest py-3.7	3m 51s
Checks	1m 17s
Run fuzz targets (macos-latest, 3.7)	35m 45s
Wheel on ubuntu-latest py-3.7	3m 18s
Run fuzz targets (ubuntu-latest, 3.7)	26m 15s
Unit tests (macos-latest, 3.7)	8m 42s
Unit tests (ubuntu-latest, 3.7)	7m 20s
Wheel on windows-latest py-3.7	4m 17s
Unit tests (windows-latest, 3.7)	12m 26s
coverage	10m 58s
Upload to PyPI	28s
	1h 54m 37s

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