[IPV6]: make extended headers to return an error at initialization

This patch factorize the code for the differents init functions for rthdr,
nodata, destopt in a single function exthdrs_init.
This function returns an error so the af_inet6 module can check correctly
the initialization.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 614f3d9..442c298 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -859,10 +859,11 @@
 		goto addrconf_fail;
 
 	/* Init v6 extension headers. */
-	ipv6_rthdr_init();
+	err = ipv6_exthdrs_init();
+	if (err)
+		goto ipv6_exthdrs_fail;
+
 	ipv6_frag_init();
-	ipv6_nodata_init();
-	ipv6_destopt_init();
 
 	/* Init v6 transport protocols. */
 	udpv6_init();
@@ -874,6 +875,8 @@
 out:
 	return err;
 
+ipv6_exthdrs_fail:
+	addrconf_cleanup();
 addrconf_fail:
 	ip6_flowlabel_cleanup();
 ip6_flowlabel_fail:
@@ -932,6 +935,7 @@
 	/* Cleanup code parts. */
 	ipv6_packet_cleanup();
 
+	ipv6_exthdrs_exit();
 	addrconf_cleanup();
 	ip6_flowlabel_cleanup();
 	ip6_route_cleanup();