[UPSTREAM] Attempt at improving ADC access

[Andy Green]

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Somebody in the thread at some point said:
| Balaji Rao wrote:
|> Sounds good. But in this case we still won't have an adc_request
|> object within adc_sync_read to read the adc result from. And there is no
|> other way we can get back the result. Isn't it ? :)
|
| Hmm, good point, the result ... you could pass a pointer to a suitable
| struct instead of just the completion. Not sure if that would be much
| nicer in the end, though.
|
| Ah well, it's pretty good already :-)

Great... maybe send a last version on the list with the double-free
fixed so I can commit it?

- -Andy
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