message: Document ONNXIFI_STATUS_INVALID_POINTER return code
diff: @@ -982,6 +982,8 @@ ONNXIFI_PUBLIC ONNXIFI_CHECK_RESULT onnxStatus ONNXIFI_ABI
  * was successfully initialized.
  * @retval ONNXIFI_STATUS_INVALID_ID The function call failed because backendID
  * is not an ONNXIFI backend ID.
  + * @retval ONNXIFI_STATUS_INVALID_POINTER The function call failed because
  + * backend pointer is NULL.
  * @retval ONNXIFI_STATUS_INVALID_PARAMETER The function call failed because one
  * of the initialization parameter
  * values is invalid.
  @@ -1213,8 +1215,8 @@ ONNXIFI_PUBLIC ONNXIFI_CHECK_RESULT onnxStatus ONNXIFI_ABI
  * backend is not an ONNXIFI backend
  * handle.
  * @retval ONNXIFI_STATUS_INVALID_POINTER The function call failed because
  - * onnxModel or weightDescriptors is
  - * NULL.
  + * onnxModel, weightDescriptors, or graph
  + * pointer is NULL.
  * @retval ONNXIFI_STATUS_INVALID_SIZE The function call failed because
  * onnxModelSize is 0.
  * @retval ONNXIFI_STATUS_INVALID_PROTOBUF The function call failed because it
  @@ -1470,6 +1472,9 @@ ONNXIFI_PUBLIC ONNXIFI_CHECK_RESULT onnxStatus ONNXIFI_ABI
  * @retval ONNXIFI_STATUS_SUCCESS The function call succeeded and the all graph
  * inputs and outputs were matched to a memory
  * location.
  + * @retval ONNXIFI_STATUS_INVALID_POINTER The function call failed because
  + * inputFence or outputFence pointer is
  + * NULL.
  * @retval ONNXIFI_STATUS_INVALID_GRAPH The function call failed because
  * graph is not an ONNXIFI graph handle.
  * @retval ONNXIFI_STATUS_UNIDENTIFIED_NAME The function call failed because
  