workaround causing TLS libs to return zero #3101
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Closes #3098
The MIP "buffer bootstrap" process causes a call to TLS functions (MbedTLS, OpenSSL) with NULL destination pointer and zero length. The intention is to pull data to start the process and have some data to size the initial buffer.
This causes these functions to return 0, thing that is correctly detected as an error condition (as per their doc, zero is an error condition) and the connection gets closed.
This PR provides a workaround for that, by catching this condition and returning 0 instead.