kdf_argon2_ctx_set_out_length
if (!kdf_argon2_ctx_set_out_length(ctx, (uint32_t)outlen))
if (!kdf_argon2_ctx_set_out_length(ctx, u32_value))
static int kdf_argon2_ctx_set_out_length(KDF_ARGON2 *ctx, uint32_t outlen);