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It can avoid potential build warn/error when CONFIG_DEBUG_FS is not set. Signed-off-by: Guchun Chen <guchun.chen@amd.com> Reviewed-by: Tao Zhou <tao.zhou1@amd.com> Reviewed-by: Dennis Li <Dennis.Li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>