IB/hfi1: Correct receive packet handler assignment

Prevent processing receive packet in case when opcode is
accepted by QP but handler for this type of packet is not
defined.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Jakub Pawlak <jakub.pawlak@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>