net: truncate output file when using dump backend
This prevents data of a previous run to be seen in the new dump file. Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NHervé Poussineau <hpoussin@reactos.org> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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