netfilter: fix warning about invalid const usage

This patch fixes the declaration of the logger structure in ebt_log
and ebt_ulog: I forgot to remove the const option from their declaration
in the commit ca735b3a ("netfilter:
use a linked list of loggers").
Pointed-out-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/netfilter/ebt_log.c

@@ -214,7 +214,7 @@ static struct xt_target ebt_log_tg_reg __read_mostly = {
 	.me		= THIS_MODULE,
 };
 
-static const struct nf_logger ebt_log_logger = {
+static struct nf_logger ebt_log_logger __read_mostly = {
 	.name 		= "ebt_log",
 	.logfn		= &ebt_log_packet,
 	.me		= THIS_MODULE,

net/bridge/netfilter/ebt_ulog.c

@@ -279,7 +279,7 @@ static struct xt_target ebt_ulog_tg_reg __read_mostly = {
 	.me		= THIS_MODULE,
 };
 
-static const struct nf_logger ebt_ulog_logger = {
+static struct nf_logger ebt_ulog_logger __read_mostly = {
 	.name		= "ulog",
 	.logfn		= &ebt_log_packet,
 	.me		= THIS_MODULE,