[openib-general] error messages for debugging

[Roland Dreier]

    Sayantan> I seem to have gotten around this issue. When I was
    Sayantan> creating the QP, I didn't specify any `max_inline_data'
    Sayantan> (i.e. left attr.qp.max_inline_data completely
    Sayantan> untouched). After I specify the `max_inline_data' and
    Sayantan> use IBV_SEND_INLINE in the `send_flags', it works.

I'm a little confused as to what happened.  I guess you left
max_inline_data uninitialized and didn't look at the value returned by
ibv_create_qp(), and then tried to post a too-large work request with
inline data?

 - R.