netfilter: Use unsigned types for hooknum and pf vars

and (try to) consistently use u_int8_t for the L3 family.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 8b21762..2a965c4 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -66,7 +66,7 @@
 		      const struct sk_buff *skb,
 		      unsigned int dataoff,
 		      enum ip_conntrack_info ctinfo,
-		      int pf,
+		      u_int8_t pf,
 		      unsigned int hooknum)
 {
 	/* If we've seen traffic both ways, this is some kind of UDP
@@ -91,7 +91,7 @@
 
 static int udp_error(struct sk_buff *skb, unsigned int dataoff,
 		     enum ip_conntrack_info *ctinfo,
-		     int pf,
+		     u_int8_t pf,
 		     unsigned int hooknum)
 {
 	unsigned int udplen = skb->len - dataoff;