On any failure, return `WOLFSSL_FAILURE`
If there was a failure and a successful processing of certs from the
same directory, the return value depended on the last cert processed
which not guarenteed to be the same order. If the last cert load
failed, it would return the specific wolfSSL error code. If it
succeeded, then WOLFSSL_FAILURE would be returned as a generic failure
due to a previous cert error.
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