netfilter: add includes to nf_socket.h

These have to be included always when nf_socket.h is included.

Signed-off-by: Máté Eckl <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/net/netfilter/nf_socket.h

···
 #ifndef _NF_SOCK_H_
 #define _NF_SOCK_H_
 
-struct net_device;
-struct sk_buff;
-struct sock;
-struct net;
+#include <net/sock.h>
+#include <net/inet_timewait_sock.h>
 
 static inline bool nf_sk_is_transparent(struct sock *sk)
 {