5047 don't use atomic_*_nv if you discard the return value

*** 1158,1168 ****
          /* By this time rport_handle is valid */
          if ((irp->irp_flags & IRP_HANDLE_OPENED) == 0) {
                  iport->iport_rp_slots[rp->rp_handle] = irp;
                  atomic_or_32(&irp->irp_flags, IRP_HANDLE_OPENED);
          }
!         (void) atomic_inc_64_nv(&iport->iport_last_change);
          fct_log_remote_port_event(port, ESC_SUNFC_TARGET_ADD,
              rp->rp_pwwn, rp->rp_id);
  
  register_rp_done:;
          rw_exit(&irp->irp_lock);
--- 1158,1168 ----
          /* By this time rport_handle is valid */
          if ((irp->irp_flags & IRP_HANDLE_OPENED) == 0) {
                  iport->iport_rp_slots[rp->rp_handle] = irp;
                  atomic_or_32(&irp->irp_flags, IRP_HANDLE_OPENED);
          }
!         atomic_inc_64(&iport->iport_last_change);
          fct_log_remote_port_event(port, ESC_SUNFC_TARGET_ADD,
              rp->rp_pwwn, rp->rp_id);
  
  register_rp_done:;
          rw_exit(&irp->irp_lock);
*** 1203,1213 ****
  
          if (irp->irp_flags & IRP_HANDLE_OPENED) {
                  atomic_and_32(&irp->irp_flags, ~IRP_HANDLE_OPENED);
                  iport->iport_rp_slots[rp->rp_handle] = NULL;
          }
!         (void) atomic_inc_64_nv(&iport->iport_last_change);
          fct_log_remote_port_event(port, ESC_SUNFC_TARGET_REMOVE,
              rp->rp_pwwn, rp->rp_id);
  
          return (FCT_SUCCESS);
  }
--- 1203,1213 ----
  
          if (irp->irp_flags & IRP_HANDLE_OPENED) {
                  atomic_and_32(&irp->irp_flags, ~IRP_HANDLE_OPENED);
                  iport->iport_rp_slots[rp->rp_handle] = NULL;
          }
!         atomic_inc_64(&iport->iport_last_change);
          fct_log_remote_port_event(port, ESC_SUNFC_TARGET_REMOVE,
              rp->rp_pwwn, rp->rp_id);
  
          return (FCT_SUCCESS);
  }