net: kill duplicate included header

For net part, remove duplicate included header.
Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/caif/caif_usb.c

@@ -11,7 +11,6 @@
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/slab.h>
-#include <linux/netdevice.h>
 #include <linux/mii.h>
 #include <linux/usb.h>
 #include <linux/usb/usbnet.h>

net/ipv4/udp_diag.c

@@ -15,7 +15,6 @@
 #include <linux/udp.h>
 #include <net/udp.h>
 #include <net/udplite.h>
-#include <linux/inet_diag.h>
 #include <linux/sock_diag.h>
 
 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,

net/openvswitch/flow.c

@@ -32,7 +32,6 @@
 #include <linux/in.h>
 #include <linux/rcupdate.h>
 #include <linux/if_arp.h>
-#include <linux/if_ether.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/tcp.h>