prometheus_exporters: ignore smartctl exit code 64

On asia.mirror.pkgbuild.com, smartctl -a --json $disk has been exiting with code 64. From smartctl(1) code 64 corresponds to "Bit 6: The device error log contains records of errors". Since we're not interested in old errors, ignore it.

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• 498b6cc5...8dd04739 - 7 commits from branch master
• fea117c3 - prometheus_exporters: ignore smartctl exit code 64

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