Fix crash on multiple start/stop due to FD being closed twice #495
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On Android, when calling start() and stop() multiple times in a VPN application using tun2socks, the program crashes with:
This happens because both
_defaultDevice.Close()and_defaultStack.Wait(), which are called insidestop(), attempt to close the same file descriptor. The issue was observed when using ParcelFileDescriptor from VpnService, where the FD is detached and passed to the tun2socks engine.