[0/10] Assorted cleanups (esp for fdt{get,put} tests)

[Jon Loeliger]

> As noted earlier, there were a few things I wasn't totally happy with
> in the recently applied fdt{get,put} patches, mostly in the test code.
> I had a look at cleaning up those problems today, which kind of
> expanded into a whole bunch of little cleanups for tests and a few
> other things.
> 
> So, here they all are.  Jon, please apply.

Whole series applied and pushed out.

Thanks,
jdl