Second set of IIO fixes for the 4.4 cycle.

Some of these were waiting for various code to hit during the merge
window - others have simply shown up recently.

* Dummy - fix a bug introduced recently that stops events actually
  reaching userspace.
* Lidar - return -EINVAL on getting a report of an invalid reading from
  the device.  This could mean that nothing is in range, or something
  else has gone wrong.  Basically it tells us nothing useful beyond the
  reading is bogus and should be ignored.
* apds9660 - make sure to call pm_runtime_mark_last_busy when reading
  from the device to avoid a premature disabling of the power.
* core - fix up a few missues of the WARN macro.
* spmi-vadc - fix a missing of_node_put when breaking out of
  a for_each_available_child_of_node loop.

The dummy driver is going to result in a slightly interesting
merge when this meets the togreg branch as that driver has graduated
from staging in the meantime.  I'll send an email in reply to that
pull request highlighting this as well.
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