re #6892 rb1796 no ENXIO after clock validation in todpc_rtcget

*** 372,382 ****
                  if ((reg & RTC_VRT) != 0)
                          break;
                  drv_usecwait(5000);             /* Delay for 5000 us */
          }
  
- 
  checkuip:
          if (uip_try-- < 0)
                  return (EAGAIN);
          outb(RTC_ADDR, RTC_A);          /* check if update in progress */
          reg = inb(RTC_DATA);
--- 372,381 ----