Possible bug in ADF4351 iio driver and utility program

Datasheet section Prescaler Value specifies prescaler should be 8/9 for output frequencies more than 3.6GHz. It doesn't specify if this value is VCO or divided output. I assume it is VCO if FEEDBACK (R4,D13) is 1 otherwise it's divided output. Linux driver always work on fundamental feedback.
should this code block be after line 152?

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