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>
diff --git a/net/caif/caif_usb.c b/net/caif/caif_usb.c
index 5fc9eca..3d737fb 100644
--- a/net/caif/caif_usb.c
+++ b/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>
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index e5e18cb..8a949f1 100644
--- a/net/ipv4/udp_diag.c
+++ b/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,
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index fe7f020..1252c30 100644
--- a/net/openvswitch/flow.c
+++ b/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>