rafs: cleanup errors #3428

Job	Run time
contrib-lint (contrib/nydusify)	56s
contrib-unit-test-coverage	1m 14s
contrib-lint (contrib/nydus-overlayfs)	35s
nydus-build (amd64)	2m 5s
contrib-build (amd64)	29s
nydus-build (arm64)	2m 5s
contrib-build (arm64)	42s
nydus-build (ppc64le)	2m 0s
cargo-deny	36s
nydusd-build-macos (amd64)	2m 13s
contrib-build (ppc64le)	42s
nydus-build (riscv64)	1m 52s
nydusd-build-macos (arm64)	2m 27s
contrib-build (riscv64)	38s
nydus-unit-test	4m 37s
nydus-unit-test-coverage	3m 14s
nydus-integration-test	4m 20s
takeover-test	11m 46s
performance-test (fs-version-5)	11m 25s
performance-test (fs-version-6)	11m 24s
performance-test (zran)	11m 18s
upload-coverage-to-codecov	12s
	1h 16m 50s

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