Second set of IIO fix for the 5.3 cycle.

* adf4371
  - Calculation of the value to program to control the output frequency
    was incorrect.
* max9611
  - Fix temperature reading in probe.  A recent fix for a wrong mask
    meant this code was looked at afresh.  A second bug became obvious
    in which the return value was used inplace of the desired register
    value.  This had no visible effect other than a communication test
    not actually testing the communications.
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