vfs: fix a typo #1122

Job	Run time
build-minimal-sysroots (x86_64)	59s
build-minimal-sysroots (riscv64)	1m 7s
build-minimal-sysroots (arm64)	1m 2s
build-toolchains (ubuntu-latest, x86_64, gnu)	38s
build-toolchains (ubuntu-latest, riscv64, gnu)	36s
build-toolchains (ubuntu-latest, arm64, gnu)	27s
build-toolchains (ubuntu-20.04, x86_64, gnu)	44s
build-toolchains (ubuntu-20.04, riscv64, gnu)	48s
build-toolchains (ubuntu-20.04, arm64, gnu)	28s
build-toolchains (macos-latest, x86_64, gnu)	59s
build-toolchains (macos-latest, riscv64, gnu)	48s
build-toolchains (macos-latest, arm64, gnu)	41s
build-toolchains (ubuntu-latest, llvm, all)	1m 4s
build-riscv	2m 31s
build	2m 46s
build-llvm-arm64	3m 0s
build-llvm	3m 14s
build-arm64	2m 41s
build-llvm-riscv64	2m 31s
run-riscv	0s
run-riscv64-llvm	0s
run-x86_64	0s
run-x86_64-llvm	0s
	27m 4s

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