[infiniband] Send xfer_window_changed() when CMRC connection is established

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/infiniband/ib_cmrc.c

 		return;
 	}
 
+	/* Notify upper connection of window change */
+	xfer_window_changed ( &cmrc->xfer );
+
 	/* If we are disconnected, close the upper connection */
 	if ( rc_cm != 0 ) {
 		ib_cmrc_close ( cmrc, rc_cm );