netfilter: add __exit mark to helper modules

There are no __exit mark in the helper modules.
because these exit functions used to be called by init function
but now that is not. so we can add __exit mark.
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_conntrack_ftp.c

@@ -566,8 +566,7 @@ static const struct nf_conntrack_expect_policy ftp_exp_policy = {
 	.timeout	= 5 * 60,
 };
 
-/* don't make this __exit, since it's called from __init ! */
-static void nf_conntrack_ftp_fini(void)
+static void __exit nf_conntrack_ftp_fini(void)
 {
 	nf_conntrack_helpers_unregister(ftp, ports_c * 2);
 	kfree(ftp_buffer);

net/netfilter/nf_conntrack_irc.c

@@ -232,8 +232,6 @@ static int help(struct sk_buff *skb, unsigned int protoff,
 static struct nf_conntrack_helper irc[MAX_PORTS] __read_mostly;
 static struct nf_conntrack_expect_policy irc_exp_policy;
 
-static void nf_conntrack_irc_fini(void);
-
 static int __init nf_conntrack_irc_init(void)
 {
 	int i, ret;
@@ -276,9 +274,7 @@ static int __init nf_conntrack_irc_init(void)
 	return 0;
 }
 
-/* This function is intentionally _NOT_ defined as __exit, because
- * it is needed by the init function */
-static void nf_conntrack_irc_fini(void)
+static void __exit nf_conntrack_irc_fini(void)
 {
 	nf_conntrack_helpers_unregister(irc, ports_c);
 	kfree(irc_buffer);

net/netfilter/nf_conntrack_sane.c

@@ -173,8 +173,7 @@ static const struct nf_conntrack_expect_policy sane_exp_policy = {
 	.timeout	= 5 * 60,
 };
 
-/* don't make this __exit, since it's called from __init ! */
-static void nf_conntrack_sane_fini(void)
+static void __exit nf_conntrack_sane_fini(void)
 {
 	nf_conntrack_helpers_unregister(sane, ports_c * 2);
 	kfree(sane_buffer);

net/netfilter/nf_conntrack_sip.c

@@ -1609,7 +1609,7 @@ static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1
 	},
 };
 
-static void nf_conntrack_sip_fini(void)
+static void __exit nf_conntrack_sip_fini(void)
 {
 	nf_conntrack_helpers_unregister(sip, ports_c * 4);
 }

net/netfilter/nf_conntrack_tftp.c

@@ -104,7 +104,7 @@ static const struct nf_conntrack_expect_policy tftp_exp_policy = {
 	.timeout	= 5 * 60,
 };
 
-static void nf_conntrack_tftp_fini(void)
+static void __exit nf_conntrack_tftp_fini(void)
 {
 	nf_conntrack_helpers_unregister(tftp, ports_c * 2);
 }