be2net: account for skb allocation failures

If we cannot allocate new skbs in RX completion handler, we should
increase netdevice rx_dropped counter, not spam console messages.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/benet/be.h
Simple merge

diff --cc drivers/net/benet/be_ethtool.c
Simple merge

diff --cc drivers/net/benet/be_main.c
Simple merge