[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/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 0ef9986..0268e11 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2193,7 +2193,7 @@
 	goto out;
 }
 
-void __exit tcpv6_exit(void)
+void tcpv6_exit(void)
 {
 	sock_release(tcp6_socket);
 	inet6_unregister_protosw(&tcpv6_protosw);