[DCCP]: Fix comment about control sockets.

These sockets now have a bit other names and are no longer global.

Shame on me, I haven't provided a good comment for this when
sending DCCP netnsization patches.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dccp/ipv6.c

@@ -33,7 +33,7 @@
 #include "ipv6.h"
 #include "feat.h"
 
-/* dccp_v6_ctl_sk is used for sending RSTs and ACKs */
+/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
 
 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;