[NETFILTER]: nf_conntrack: mark helpers __read_mostly

Most are __read_mostly already, this changes the remaining ones.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 198330b..cd9c2d0 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -518,8 +518,8 @@
 	return ret;
 }
 
-static struct nf_conntrack_helper ftp[MAX_PORTS][2];
-static char ftp_names[MAX_PORTS][2][sizeof("ftp-65535")];
+static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly;
+static char ftp_names[MAX_PORTS][2][sizeof("ftp-65535")] __read_mostly;
 
 /* don't make this __exit, since it's called from __init ! */
 static void nf_conntrack_ftp_fini(void)