nall: correctly handle TCP peer disconnections in tcp-socket.cpp #1365
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Currently, when a client disconnects, the server in Ares fails to notice and to call the onDisconnect hook, which in turns cause the server to stop responding (it won't accept a new client, and will never receive more data from the disconnected one).
This commit fixes it by correctly handling the recv() return code to detect peer disconnections (return value 0) and any other kind of error (return value < 0).