EVP,KDF: Add more error code along some return 0 in ...

methods :
 - EVP_PBE_scrypt
 - EVP_PKEY_meth_add0
 - EVP_PKEY_meth_new
 - EVP_PKEY_CTX_dup

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/5783)