fix clippy warning #1831

Job	Run time
compile_and_lint	2m 48s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 39s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 58s
windows_test	3m 20s
test (odbc, postgres, Driver=/usr/lib/x86_64-linux-gnu/odbc/psqlodbcw.so;Server=127.0.0.1;Port=54...	3m 17s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 30s
docker_build (linux/arm64)	10m 20s
docker_build (linux/amd64)	5m 20s
docker_build (linux/arm/v7)	5m 51s
docker_push	21s
	37m 24s

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