mi: fix the return error code. #837
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When returning a system error code (i.e. rc < 0), the function should return -1 and set errno instead of returning the errno directly. It is very helpful for the client to handle the rc in an unified way. Signed-off-by: Hao Jiang <jianghao@google.com> Signed-off-by: Jinliang Wang <jinliangw@google.com>
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When returning a system error code (i.e. rc < 0), the function should return -1 and set errno instead of returning the errno directly. It is very helpful for the client to handle the rc in an unified way.