[NETFILTER]: nf_nat: fix NF_NAT dependency

NF_NAT depends on NF_CONNTRACK_IPV4, not NF_CONNTRACK.

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/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 363df99..f6026d4 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -401,7 +401,7 @@
 # NAT + specific targets: nf_conntrack
 config NF_NAT
 	tristate "Full NAT"
-	depends on IP_NF_IPTABLES && NF_CONNTRACK
+	depends on IP_NF_IPTABLES && NF_CONNTRACK_IPV4
 	help
 	  The Full NAT option allows masquerading, port forwarding and other
 	  forms of full Network Address Port Translation.  It is controlled by