[openssl-project] to fully overlap or not to

[Andy Polyakov]

> Related
> thing to recognize in the context is that *disputable* condition, the
> one that triggered this discussion, is exercised only when
> ctx->block_size is larger than 1, because then ctx->buf_len remains 0.

I naturally meant "because *otherwise* ctx->buf_len remains 0". In other
words ctx->buf_len remains 0 when ctx->block_size is 1.