RDS: remove old rs_transport comment

rs_transport is now also used by the rdma paths once the socket is
bound.  We don't need this stale comment to tell us what cscope can.
Signed-off-by: NZach Brown <zach.brown@oracle.com>

net/rds/rds.h

@@ -457,12 +457,6 @@ struct rds_sock {
 	__be32			rs_conn_addr;
 	__be16			rs_bound_port;
 	__be16			rs_conn_port;
-
-	/*
-	 * This is only used to communicate the transport between bind and
-	 * initiating connections.  All other trans use is referenced through
-	 * the connection.
-	 */
 	struct rds_transport    *rs_transport;
 
 	/*