Second round (request 2) 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
* Double free in industrialio-event.c
* Ancient bug in tsl2563 in which the interrupt disable code
  was inverted (i.e. it enable the interrupts)

Fixes for the adsi16400 driver have been postponed and will now be queued
up for the next merge window at Greg's suggestion given their large
size and invasive nature. The relevant code never worked so it
wasn't a regression.

Jonathan
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