According to the context, here we are checking net->downscript's validity,
Signed-off-by: NLiao Pingfang <liao.pingfang@zte.com.cn>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>