dns: add a check before setting NDPI_MALFORMED_PACKET risk
#2558
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"Invalid DNS Header"-risk should be set only if the flow has been already classified as DNS. Otherwise, almost any non-DNS flows on port 53 will end up having the `NDPI_MALFORMED_PACKET` risk set, which is a little bit confusing for non DNS traffic
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"Invalid DNS Header"-risk should be set only if the flow has been already classified as DNS. Otherwise, almost any non-DNS flows on port 53 will end up having the
NDPI_MALFORMED_PACKETrisk set, which is a little bit confusing for non DNS traffic