style: fix a conditionally-unused import #577

Job	Run time
Checking fmt and docs	27s
Build and test: ubuntu-latest, stable	56s
clippy	27s
fuzz_read	3h 16m 27s
Build and test: ubuntu-latest, nightly	1m 47s
Build and test: ubuntu-latest, msrv	1m 2s
fuzz_read_with_no_features	2h 36m 38s
fuzz_write_with_no_features	28m 3s
Build and test: macOS-latest, stable	1m 18s
fuzz_write	3h 28m 13s
Build and test: macOS-latest, nightly	2m 20s
Build and test: macOS-latest, msrv	2m 25s
Build and test: windows-latest, stable	3m 26s
Build and test: windows-latest, nightly	2m 3s
Build and test: windows-latest, msrv	2m 4s
	10h 7m 36s

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