vfs: reset state after failed mount #8912

Job	Run time
github.event_name == 'workflow_dispatch' && 'Skipped job' \|\| 'Build slim tarball'	-1s
aarch64-linux: Cache V8 build	-1s
aarch64-linux: with shared ${{ matrix.openssl.name }}	-1s
${{ matrix.system }}: with shared libraries	-1s
	-4s

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