Merge branch '170724' of github.com:jwpi/util-linux

Merge branch '170724' of github.com:jwpi/util-linux

* '170724' of github.com:jwpi/util-linux:
  hwclock: fix hclock_valid test and error messages
  hwclock: remove busywait tristate return status
  hwclock: restore select() timeout warning
  hwclock: update man page
  hwclock: correlate hclocktime instead of set_time.
  hwclock: fix RTC read logic
  hwclock: move drift correction and --predict
  hwclock: move rtc permissions test
  hwclock: move systz above init clocks read