xfrm6: Remove commented out function call to xfrm6_input_fini

xfrm6_input_fini() is not in the tree since more than 10 years,
so remove the commented out function call.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 6ce4a4f..c984413 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -356,7 +356,6 @@
 	if (sysctl_hdr)
 		unregister_net_sysctl_table(sysctl_hdr);
 #endif
-	//xfrm6_input_fini();
 	xfrm6_policy_fini();
 	xfrm6_state_fini();
 	dst_entries_destroy(&xfrm6_dst_ops);