qemu.py: use os.path.null instead of /dev/null
For increased portability, let's use os.path.devnull. Signed-off-by: NAmador Pahim <apahim@redhat.com> Message-Id: <20170901112829.2571-4-apahim@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
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