Memory leak when using OpenVino

[yutkin]

Tried to use OpenVino as a backend type. All works fine except a memory leak:

Code that leaks: I'm reading an image in an infinite loop and doing "forward" on it.

package main

import (
	"fmt"
	"gocv.io/x/gocv"
	"image"
	"time"
)

func main() {
	net := gocv.ReadNet("face-detection-retail-0005.bin", "face-detection-retail-0005.xml")

	if net.Empty() {
		fmt.Println("Error reading network model")
		return
	}

	net.SetPreferableBackend(gocv.NetBackendOpenVINO)
	net.SetPreferableTarget(gocv.NetTargetCPU)

	defer net.Close()

	for {
		img := gocv.IMRead("photo.jpg", gocv.IMReadColor)
		blob := gocv.BlobFromImage(img, 1, image.Pt(300, 300), gocv.Scalar{},false, false)

		net.SetInput(blob, "")

		t1 := time.Now()

		prob := net.Forward("")

		fmt.Println("Inference time:", time.Since(t1))

		for i := 0; i < prob.Total(); i += 7 {
			confidence := prob.GetFloatAt(0, i+2)
			if confidence > 0.5 {
				_ = int(prob.GetFloatAt(0, i+3) * float32(img.Cols()))
				_ = int(prob.GetFloatAt(0, i+4) * float32(img.Rows()))
				_ = int(prob.GetFloatAt(0, i+5) * float32(img.Cols()))
				_ = int(prob.GetFloatAt(0, i+6) * float32(img.Rows()))
			}
		}
		blob.Close()
		prob.Close()
		img.Close()
	}
}

go version go1.13.5 linux/amd64 gocv commit: 2d8275b67baa022d6abeda69508821f6b1db015c