intermittent unreleased lock in `Socket::Socket`

[softwareCobbler]

There is a lock owned by a shared_ptr<dap::Socket::Shared> which seems to be never released if shared_ptr::reset is called while the lock is held.

The resets are called when bind or listen fails. I was trying to connect to an already in-use socket when this happened. Instead of ending up in the onError handler, the program became unresponsive.

cppdap/src/socket.cpp

Line 237 in 88e8952

shared.reset();