[PATCH] cleanup: remove declared variables without any references

[Agovic, Sanimir]

Thanks for your review.

> I know it's a lot of files, but all these changes should be mostly
> independent, so we could go one file at a time, a few files each day.
> When we've finished reviewing the a batch, just send another. WDYT?
Agreed. This way changes will end up sooner into master and will ease
reviews.

 -Sanimir

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