Merge tag 'iio-for-3.15c' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...

Merge tag 'iio-for-3.15c' of git://git./linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

Third IIO new drivers and cleanups series for 3.15.

New driver
* Xilinx XADC driver -  This has been ready for a while but was awaiting
  a device tree ack (or as it turns out 3+ weeks).

Cleanup
* Drop some unreachable code from mag3110 highlighted by smatch.

Fix
* vf610 - introduced this cycle - put a possible negative error code
  into an unsigned long. Another smatch find - this one promoted by
  guilt that Dan was busy fixing all our messups.