MAINTAINERS: The socketcan-core list is subscribers-only.

When I posted a copy_to_user fixes, the list daemon refused to accept
the Cc: <this-list>, because I was not a subscriber.

I found, that other lists with such a feature are marked respectively
in the MAINTAINERS file.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NOliver Hartkopp <oliver.hartkopp@volkswagen.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -1026,7 +1026,7 @@ P:	Urs Thuermann
 M:	urs.thuermann@volkswagen.de
 P:	Oliver Hartkopp
 M:	oliver.hartkopp@volkswagen.de
-L:	socketcan-core@lists.berlios.de
+L:	socketcan-core@lists.berlios.de (subscribers-only)
 W:	http://developer.berlios.de/projects/socketcan/
 S:	Maintained