Vincenzo Maffione 9ec71596c0 netmap: if_vtnet: avoid netmap ring wraparound
netmap assumes the one "slot" is left unused to distinguish
the empty ring and full ring conditions. This assumption was
violated by vtnet_netmap_rxq_populate().

MFC after:	1 week
2020-06-01 16:14:29 +00:00
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