[Rpm-maint] [rpm-software-management/rpm] Ensure negation comes *after* division (#1542)

[Demi Marie Obenour]

> Argh, should've caught that in review 
> Nicely highlights how bleeping subtle this code is though - changing often ends up just moving a trouble elsewhere.

Would you be interested in OSS-Fuzz integration?  Also, we might be able to use [EverParse](https://github.com/project-everest/everparse) for some of this; the parsers it generates are (IIRC) portable C and come with a proof of correctness.

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