fix clippy #598

Job	Run time
cargo-toml-fmt	8s
Cancel Previous Runs	3s
license-check	1m 11s
Rust check cargo build --release	10m 53s
Rust check cargo build --release --features skip-ias-check	7m 56s
Rust check cargo build --release --features dot	8m 0s
Rust check cargo build --release --features ksm	7m 52s
Rust check cargo test --all --features runtime-benchmarks	9m 10s
Rust check cargo test --all --features skip-ias-check	7m 58s
Rust check cargo test --all --features dot	8m 22s
Rust check cargo test --all --features ksm	7m 59s
Rust check cargo fmt --all -- --check	41s
Rust check cargo clippy -- -D warnings	6m 26s
	1h 16m 39s

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