bonding: convert IS_UP(slave->dev) to inline function

Also, remove the IFF_UP verification cause we can't be netif_running() with
being also IFF_UP.

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/bonding/bond_3ad.c
Simple merge

diff --cc drivers/net/bonding/bond_main.c
Simple merge

diff --cc drivers/net/bonding/bond_options.c
Simple merge

diff --cc drivers/net/bonding/bonding.h
Simple merge