engines/dasync: add explaining comments about AES-128-CBC-HMAC-SHA1
Fixes #7950 It was reported that there might be a null pointer dereference in the implementation of the dasync_aes_128_cbc_hmac_sha1() cipher, because EVP_aes_128_cbc_hmac_sha1() can return a null pointer if AES-NI is not available. It took some analysis to find out that this is not an issue in practice, and these comments explain the reason to comfort further NPD hunters. Detected by GitHub user @wurongxin1987 using the Sourcebrella Pinpoint static analyzer. Reviewed-by:Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8305) (cherry picked from commit a4a0a1eb43cfccd128d085932a567e0482fbfe47)
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