[coreboot-gerrit] [S] Change in coreboot[main]: lib/string: change return types to match C standard

[Elyes Haouas (Code Review)]

Attention is currently required from: Arthur Heymans, Felix Held, Martin L Roth.

Elyes Haouas has posted comments on this change by Felix Held. ( https://review.coreboot.org/c/coreboot/+/83223?usp=email )

Change subject: lib/string: change return types to match C standard
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Patch Set 1: Code-Review+2