_Cfunc_GoBytes taking lot of memory and not releasing it. Go profiler screenshot

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##### System information (version) * OpenCV => 4 * GoCV => 0.18.0 * Operating System / Platform => Raspberry Pi * Compiler => GCC

Detailed description

1. Installed the OpenCV and GoCV from the source. After I ran the IMEncode to convert a gocv.Mat type to []byte. Over the time the Go Profiling result shows increasing in alloc_space.

Steps to reproduce

1. Create Go Routine
2. Calls a method accepts a gocv.Mat type and converts Mat to byte
3. Do that for 5-10 min and same time run the profiler.
4. Below is a screen shot from the go profiler