rcv_has_same_class only needs access to the MAD header
specify WR and Receive WC as const
Reviewed-By: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: NSean Hefty <sean.hefty@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>