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

@@ -1158,11 +1158,11 @@
         /* 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);
+        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);

@@ -1203,11 +1203,11 @@
 
         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);
+        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);
 }