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We should also check if the return error code is greater than 0 (SBI_SUCCESS), as this is an invalid error. Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>