Fix `clippy::unnecessary_first_then_check` lint #656

Job	Run time
cargo clippy (wasm32)	36s
cargo check (msrv) (wasm32)	23s
cargo clippy (windows-latest)	1m 6s
cargo check (msrv) (windows-latest)	51s
cargo clippy (macos-latest)	39s
cargo check (msrv) (macos-latest)	30s
cargo doc	22s
cargo clippy (ubuntu-latest)	40s
cargo fmt	21s
cargo check (msrv) (ubuntu-latest)	21s
cargo test (windows-latest)	54s
cargo test (wasm32)	18s
cargo test (macos-latest)	23s
typos	5s
cargo test (ubuntu-latest)	21s
	7m 50s

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