[openib-general] segmentation fault in ibv_modify_srq

[Roland Dreier]

OK, I just checked in an initial implementation of both setting the
SRQ limit with the modify SRQ verb, and also getting SRP limit reached
events when the occur.  You will need to update your kernel drivers,
libibverbs and libmthca to get this.

I've done zero testing, so please let me know how it works.  You
should at least get an interesting new failure.

 - R.