util: vircgroup: move virCgroupGetValueStr out of virCgroupGetValueForBlkDev
If we need to get a path of specific file and we need to check its existence before we use it then we can reuse that path to get value for specific device. This way we will not build the path again in virCgroupGetValueForBlkDev. Signed-off-by: NPavel Hrdina <phrdina@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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