Invalid certificate in ssl_multicert leads to a crash

[vmamidi]

invalid certificate in ssl_multicert.config leads to fatal error. crash is disguised as a vsnprintf seg fault

[bryancall]

This will crash when there is a non-existing file.

[cmcfarlen]

I was not able to reproduce this. I tried a non-existing file, and a corrupted file both at startup and on reload.

[github-actions[bot]]

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