[IPV6]: fix section mismatch warnings

Removed useless and buggy __exit section in the different
ipv6 subsystems. Otherwise they will be called inside an
init section during rollbacking in case of an error in the
protocol initialization.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8cbdcc9..8b3e6d6 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1035,7 +1035,7 @@
 	goto out;
 }
 
-void __exit udpv6_exit(void)
+void udpv6_exit(void)
 {
 	inet6_unregister_protosw(&udpv6_protosw);
 	inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);