Fix typing error
### Pull Request Readiness Checklist
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- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
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Patch to opencv_extra has the same branch name.
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* fix(wechat_qrcode): Initialize nBytes after the count value is determined
* fix(wechat_qrcode): Incorrect count data repair
* chore: format expr
* fix(wechat_qrcode): Avoid null pointer exception
* fix(wechat_qrcode): return when bytes_ is empty
* test(wechat_qrcode): add test case
---------
Co-authored-by: GZTime <Time.GZ@outlook.com>
### Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
The bug has already been reported and explained on the OpenCV forum:
- [optflow-calcopticalflowsparserlof-giving-assertion-error](https://forum.opencv.org/t/cv2-optflow-calcopticalflowsparserlof-giving-assertion-error/4835)
- [calcopticalflowsparserlof-assertion-error-in-initialflow](https://forum.opencv.org/t/calcopticalflowsparserlof-assertion-error-in-initialflow/8669)
The bug is manifested only if 'UseInitialFlow' is set to true and 'ForwardBackwardThreshold' > 0 (enabled).
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