Revert "proto_to_name duplication" patch, as noticed by Yasuyuki it can cause
invalid arguments to get accepted.
diff --git a/iptables.c b/iptables.c
index 74925af..28917cf 100644
--- a/iptables.c
+++ b/iptables.c
@@ -229,10 +229,9 @@
 	{ "esp", IPPROTO_ESP },
 	{ "ah", IPPROTO_AH },
 	{ "sctp", IPPROTO_SCTP },
-	{ "dccp", IPPROTO_DCCP },
 };
 
-char *
+static char *
 proto_to_name(u_int8_t proto, int nolookup)
 {
 	unsigned int i;