system/FileDescriptor: Close() should not be called on undefined object
system/FileDescriptor: Close() should not be called on undefined object

It does not do much harm - but it causes an unnecessary (failing)
system call.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy