message: Use correct buffer length in EcPointEncode
diff: @@ -425,7 +425,7 @@ util::StatusOr<std::string> SubtleUtilBoringSSL::EcPointEncode(
  std::unique_ptr<uint8_t[]> encoded(new uint8_t[1 + curve_size_in_bytes]);
  size_t size = EC_POINT_point2oct(
  group.get(), point, POINT_CONVERSION_COMPRESSED, encoded.get(),
  - 1 + 2 * curve_size_in_bytes, nullptr);
  + 1 + curve_size_in_bytes, nullptr);
  if (size != 1 + curve_size_in_bytes) {
  return util::Status(util::error::INTERNAL, "EC_POINT_point2oct failed");
  }
  