[NETFILTER]: x_tables: unify IPv4/IPv6 esp match

This unifies ipt_esp and ip6t_esp to xt_esp. Please note that now
a user program needs to specify IPPROTO_ESP as protocol to use esp match
with IPv6. This means that ip6tables requires '-p esp' like iptables.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 98f7875..bdd569f 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -115,11 +115,11 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP6_NF_MATCH_AHESP
-	tristate "AH/ESP match support"
+config IP6_NF_MATCH_AH
+	tristate "AH match support"
 	depends on IP6_NF_IPTABLES
 	help
-	  This module allows one to match AH and ESP packets.
+	  This module allows one to match AH packets.
 
 	  To compile it as a module, choose M here.  If unsure, say N.