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io: some fixes to handling of /dev/null when running commands
The /dev/null file handle was leaked in a couple of places. There is also the possibility that both readfd and writefd point to the same /dev/null file handle, so care must be taken not to close the same file handle twice. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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