[openib-general] module refcounting

[Roland Dreier]

    Michael> Hi!  It seems currently I am unable to remove the
    Michael> ib_mthca modules if opensm is running.

I actually don't know what is incrementing the reference count of the
ib_mthca module.  However it's probably a good thing because all sorts
of problems will arise if ib_mthca is removed while opensm is still
running and trying to send MADs, etc.

 - R.