globally replace NETFILTER_VERSION with IPTABLES_VERSION to have consistent naming
diff --git a/extensions/libipt_quota.c b/extensions/libipt_quota.c
index d95b8a1..078f9e3 100644
--- a/extensions/libipt_quota.c
+++ b/extensions/libipt_quota.c
@@ -95,7 +95,7 @@
 
 struct iptables_match quota = { NULL,
         "quota",
-        NETFILTER_VERSION,
+        IPTABLES_VERSION,
         IPT_ALIGN(sizeof (struct ipt_quota_info)),
         IPT_ALIGN(sizeof (struct ipt_quota_info)),
         &help,