ethdev: remove useless stats zeroing in drivers
The rte_eth_stats_get is the only API that should call the device
statistics function directly, and it already does a memset of the
resulting structure since commit
02331c16ec0ba. Therefore doing
memset() in the driver is redundant and should be removed.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
[David: remove also in igbvf and pcap PMDs]
Acked-By: David Marchand <david.marchand@6wind.com>