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aea90a9e31
dnn: improve robustness of MVN layer#28308 This change adds small defensive improvements to the MVN layer implementation: ->Guard against zero-sized OpenCL kernel launches ->Add input validation in finalize() ->Use int64 for FLOPS computation to avoid overflow No functional or performance changes are intended. ### 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 - [ ] 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