Merge tag 'iio-fixes-for-4.16a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus

Jonathan writes:

First round of IIO fixes for the 4.16 cycle.

One nasty very old crash around polling for buffers that aren't there
- though that can only cause effects on drivers that support events
but not buffers.

* buffer / kfifo handling in the core.
  - Check there is a buffer and return 0 from poll directly if there
    isn't.  Poll doesn't make sense in this circumstances, but best to close
    the hole.
* ad5933
  - Change the marked buffer mode to a software buffer as the meaning of
    the hardware buffer label has long since changed and this uses a front
    end software buffer anyway.
* ad7192
  - Fix the fact the external clock frequency was only set when using the
    internal clock which was less than helpful.
* adis_lib
  - Initialize the trigger before requesting the interrupt.  Some newer
    parts can power up with interrupt generation enabled so ordering now
    matters.
* aspeed-adc
  - Fix an errror handling path as labels and general ordering were wrong.
* srf08
  - Fix a link error due to undefined devm_iio_triggered_buffer_setup.
* stm32-adc
  - Fix error handling unwind squence in stm32h7_adc_enable.

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