test_calib3d: usac_Homography.accuracy crash (Debug+Windows)

http://pullrequest.opencv.org/buildbot/builders/master_noOCL_noICV_noSSE-win64-vc14-debug/builds/11259 (since Aug 15)

```
[ RUN      ] usac_Homography.accuracy
Process returned: 3221226505
```

3.4 branch looks like not affected.