[riot-notifications] [RIOT-OS/RIOT] fmt: fix fmt_s32_dec() and fmt_s64_dec() sign bit handling (#10784)

Kaspar Schleiser notifications at github.com
Wed Jan 16 17:30:33 CET 2019


> `+ negative` (which is returned from a boolean operation) is defined behaviour? _raiseseyebrow_

I think ```(val < 1)``` was promoted to integer on assignment to ```unsigned negative```...

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