Second round of fixes for IIO in 3.7 cycle, applies to 3.7-rc1.

A mixed bag of fixes mainly for drivers but with one core
double free fix.

* A couple of little fixlets for the hid-sensors drivers.
* Incorrect return value in adt7410
* Fix up support for the adis16334 in the adis16400 driver.
  Turned out there were some bits and bobs that need to be
  handled different for this part.  This seems like a large
  patch series but this is mostly because an additional chip
  specific callback is needed to handle the variations.
* Double free in industrialio-event.c
* Ancient bug in tsl2563 in which the interrupt disable code
  was inverted (i.e. it enable the interrupts)

Jonathan
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