base64.cpp: explicit signed char

ngscopeclient / scopehal

Test and measurement hardware abstraction library and protocol decodes. This is the library only. Most users should use scopehal-apps.

BSD 3-Clause "New" or "Revised" License

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base64.cpp: explicit signed char #888

Closed erdnaxe closed 2 months ago

erdnaxe commented 2 months ago

signed/unsigned char is implementation-dependent. This seems to break linux-aarch64 compilation (build logs). Let's explicit signed char to fix aarch64 compilation.

Fix https://github.com/ngscopeclient/scopehal/issues/887.