netfilter: fix fallout from xt/nf osf separation

Stephen Rothwell says:
today's linux-next build (x86_64 allmodconfig) produced this warning:
./usr/include/linux/netfilter/nf_osf.h:25: found __[us]{8,16,32,64} type without #include <linux/types.h>

Fix that up and also move kernel-private struct out of uapi (it was not
exposed in any released kernel version).

tested via allmodconfig build + make headers_check.

Reported-by: Stephen Rothwell <[e-mail]>
Fixes: bfb15f2a95cb ("netfilter: extract Passive OS fingerprint infrastructure from xt_osf")
Signed-off-by: Florian Westphal <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/linux/netfilter/nf_osf.h

···
 	FMATCH_OPT_WRONG,
 };
 
+struct nf_osf_finger {
+	struct rcu_head			rcu_head;
+	struct list_head		finger_entry;
+	struct nf_osf_user_finger	finger;
+};
+
 bool nf_osf_match(const struct sk_buff *skb, u_int8_t family,
 		  int hooknum, struct net_device *in, struct net_device *out,
 		  const struct nf_osf_info *info, struct net *net,

include/uapi/linux/netfilter/nf_osf.h

···
 #ifndef _NF_OSF_H
 #define _NF_OSF_H
 
+#include <linux/types.h>
+
 #define MAXGENRELEN	32
 
 #define NF_OSF_GENRE	(1 << 0)
···
 
 	/* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
 	struct nf_osf_opt	opt[MAX_IPOPTLEN];
-};
-
-struct nf_osf_finger {
-	struct rcu_head			rcu_head;
-	struct list_head		finger_entry;
-	struct nf_osf_user_finger	finger;
 };
 
 struct nf_osf_nlmsg {