netlink: fill in missing MODULE_DESCRIPTION()

W=1 builds now warn if a module is built without
a MODULE_DESCRIPTION(). Fill it in for sock_diag.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: kuba-moo

net/netlink/diag.c

@@ -257,5 +257,6 @@ static void __exit netlink_diag_exit(void)
 
 module_init(netlink_diag_init);
 module_exit(netlink_diag_exit);
+MODULE_DESCRIPTION("Netlink-based socket monitoring/diagnostic interface (sock_diag)");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);