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input_fd & output_fd may be the same FD. In that case, mark both as -1 when closing one. That avoids a dangling FD reference. Signed-off-by: Jason Andryuk <jandryuk@gmail.com> Acked-by: Wei Liu <wl@xen.org> Reviewed-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Release-acked-by: Paul Durrant <paul@xen.org>