message: dnn: fix sporadic crashes in getUMat()
  Incorrect "total" buffer size calculated in StdMatAllocator::allocate() due wrong step values.
diff: @@ -692,8 +692,11 @@ void TFImporter::populateNet(Net dstNet)
  int dst_i = (j * chMultiplier + i) * height* width + s;
  dst[dst_i] = src[src_i];
  }
  + // TODO Use reshape instead
  kshape[0] = inCh * chMultiplier;
  kshape[1] = 1;
  + size_t* kstep = layerParams.blobs[0].step.p;
  + kstep[0] = kstep[1]; // fix steps too
  }
  layerParams.set("kernel_h", kshape[2]);
  layerParams.set("kernel_w", kshape[3]);
  