[lacp] Check the partner's own state when checking for blocked links

The blocked link test in eth_slow_lacp_rx() is performed before the
actor TLV is copied to the partner TLV, and so must test the actor
state field rather than the partner state field.

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

src/net/eth_slow.c

 	 * then block the link until after the next expected LACP
 	 * packet.
 	 */
-	if ( ~lacp->partner.state & ( LACP_STATE_IN_SYNC |
-				      LACP_STATE_COLLECTING |
-				      LACP_STATE_DISTRIBUTING ) ) {
+	if ( ~lacp->actor.state & ( LACP_STATE_IN_SYNC |
+				    LACP_STATE_COLLECTING |
+				    LACP_STATE_DISTRIBUTING ) ) {
 		DBGC ( netdev, "SLOW %s LACP partner is down\n", netdev->name );
-		interval = ( ( lacp->partner.state & LACP_STATE_FAST ) ?
+		interval = ( ( lacp->actor.state & LACP_STATE_FAST ) ?
 			     ( ( LACP_INTERVAL_FAST + 1 ) * TICKS_PER_SEC ) :
 			     ( ( LACP_INTERVAL_SLOW + 1 ) * TICKS_PER_SEC ) );
 		netdev_link_block ( netdev, interval );