Some drivers do not provide per-queue statistics. So, there is no point
to have these misleading zeros in xstats.
Fixes: f30e69b41f ("ethdev: add device flag to bypass auto-filled queue xstats")
Cc: stable@dpdk.org
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>