[NETFILTER]: Change tunables to __read_mostly

Change some netfilter tunables to __read_mostly.  Also fixed some
incorrect file reference comments while I was in there.

(this will be my last __read_mostly patch unless someone points out
something else that needs it)

Signed-off-by: Brian Haley <brian.haley@hp.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 276a964..80060cb 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -53,7 +53,7 @@
 typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
 
 static unsigned char copy_mode = IPQ_COPY_NONE;
-static unsigned int queue_maxlen = IPQ_QMAX_DEFAULT;
+static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
 static DEFINE_RWLOCK(queue_lock);
 static int peer_pid;
 static unsigned int copy_range;