ipv6: Fix useless proc net sockstat6 removal

This call is no longer needed, sockstat6 is per namespace so it is
removed at the namespace subsystem destruction.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/proc.c

@@ -286,7 +286,6 @@ proc_net_fail:
 
 void ipv6_misc_proc_exit(void)
 {
-	proc_net_remove(&init_net, "sockstat6");
 	proc_net_remove(&init_net, "dev_snmp6");
 	proc_net_remove(&init_net, "snmp6");
 	unregister_pernet_subsys(&ipv6_proc_ops);