scrypt: free the MD reference correctly.
The code was calling EVP_MD_meth_free which is incorrect.  It should call
EVP_MD_free.  It happened to work but by luck rather than design.
@@ -75,7 +75,7 @@ static void kdf_scrypt_free(void *vctx)
KDF_SCRYPT *ctx = (KDF_SCRYPT *)vctx;
if (ctx != NULL) {
- EVP_MD_meth_free(ctx->sha256);
+ EVP_MD_free(ctx->sha256);
kdf_scrypt_reset(ctx);
OPENSSL_free(ctx);
}
