DRBG: Remove 'randomness' buffer from 'RAND_DRBG'
The DRBG callbacks 'get_entropy()' and 'cleanup_entropy()' are designed in such a way that the randomness buffer does not have to be allocated by the calling function. It receives the address of a dynamically allocated buffer from get_entropy() and returns this address to cleanup_entropy(), where it is freed. If these two calls are properly paired, the address can be stored in a stack local variable of the calling function, so there is no need for having a 'randomness' member (and a 'filled' member) in 'RAND_DRBG'. Reviewed-by: Paul Dale <paul.dale@oracle.com> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4266)
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