bug#2972: KRFB: Crashes after the VNC client disconnect
KRFB crushes just the client disconnect.
I have seen this behavior long ago but it was mysterious.
Currently, on Debian 9 , and today on Debian 10, the behaviour is stable reproducible.
After observing I have seen that there is called a function of the thread exiting but for main thread of the process.
Then the fixing is just natural exiting the process.
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