net: remove duplicated include from net_failover.c

Remove duplicated include.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/net_failover.c

@@ -19,7 +19,6 @@
 #include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/netdevice.h>
 #include <linux/netpoll.h>
 #include <linux/rtnetlink.h>
 #include <linux/if_vlan.h>