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Add is_valid_path API to check whether the sysfs file is present or not. Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Wyes Karny <wyes.karny@amd.com> Tested-by: Perry Yuan <Perry.Yuan@amd.com> Acked-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>