eng_devcrypto: expand digest failure cases
Return failure when the digest_ctx is null in digest_update and digest_final, and when md is null in digest_final. Signed-off-by: NEneas U de Queiroz <cote2004-github@yahoo.com> Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: NRichard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7585) (cherry picked from commit 4d9f99654441e36fdcb49540a1dbc9d4c70ccb68)
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