Merge pull request #29132 from hcy11123323:4.x

core: fix inverted continuity check in cvReshapeMatND() #29132

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- [√] I agree to contribute to the project under Apache 2 License.
- [√] 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
- [ ] 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

modules/core/src/array.cpp

@@ -2660,7 +2660,7 @@ cvReshapeMatND( const CvArr* arr,
                 mat = &stub;
             }
 
-            if( CV_IS_MAT_CONT( mat->type ))
+            if( !CV_IS_MAT_CONT( mat->type ))
                 CV_Error( cv::Error::StsBadArg, "Non-continuous nD arrays are not supported" );
 
             size1 = mat->dim[0].size;