cert: fix clippy get_first finding #1261

Job	Run time
Clippy	29s
Validate external types appearing in public API	57s
Measure coverage	48s
Check cross compilation targets	37s
Cargo Deny	13s
Feature Powerset	37s
Verify that no-std modes do not rely on libstd (--no-default-features)	12s
Cargo Package	23s
Verify that no-std modes do not rely on libstd (--no-default-features --features alloc)	17s
Check for documentation errors (stable)	25s
Check for documentation errors (beta)	23s
MSRV	1m 29s
Check for documentation errors (nightly)	24s
Format	15s
Check semver compatibility	25s
Build+test (--all-features, stable)	47s
Build+test (stable, ubuntu-20.04)	33s
Build+test (--features=alloc, stable, ubuntu-20.04)	38s
Build+test (--no-default-features, stable, ubuntu-20.04)	21s
Build+test (--no-default-features --features alloc,std, stable, ubuntu-20.04)	21s
Build+test (--all-features, --release, stable, ubuntu-20.04)	1m 30s
Build+test (--all-features, nightly, ubuntu-20.04)	42s
Build+test (--all-features, beta, ubuntu-20.04)	43s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, macos-latest)	1m 45s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, windows-latest)	3m 55s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, ubuntu-latest)	42s
	19m 51s

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