d0b6f0f1cd
NULL "name" argument to irq_establish indicates that the device will maintain an evcnt structure for this interrupt. In this case, irq_establish will still maintain its own count (for DDB machine irqstat), but won't attach it to the global list. Change use of ev_group and ev_name to follow guidelines in evcnt(9). Switch arckbd(4) over to the new arrangements.