Merge branch 'net-stats-helpers'

Li Zetao says:

====================
Use helper functions to update stats

The patch set uses the helper functions dev_sw_netstats_rx_add() and
dev_sw_netstats_tx_add() to update stats, which is the same as
implementing the function separately.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>