Remove unnecessary DRBG_RESEED state
The DRBG_RESEED state plays an analogue role to the |reseed_required_flag| in Appendix B.3.4 of [NIST SP 800-90A Rev. 1]. The latter is a local variable, the scope of which is limited to the RAND_DRBG_generate() function. Hence there is no need for a DRBG_RESEED state outside of the generate function. This state was removed and replaced by a local variable |reseed_required|. Reviewed-by: Paul Dale <paul.dale@oracle.com> Reviewed-by: Kurt Roeckx <kurt@roeckx.be> Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Ben Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/4328)
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