Fix memory/socket leak in UniqueId::ethernetMacAddress()
#3392
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Don't jump over `close()`/`free()`
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what
Don't jump over
close()/free()calls. Release the resources correctly in all code paths.why
Currently, there are memory, and, in case of Linux, socket leaks.
goto endjumps over the calls that are supposed to release the memory/close the socket.references
Initially discovered this on v2 - #3391 - but turns out the code is the same on v3 too.