staging: wilc1000: use 'void' return for wilc_wlan_txq_filter_dup_tcp_ack()

Use 'void' return for wilc_wlan_txq_filter_dup_tcp_ack() as it always
return value '1' and its not used by the caller.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wlan.c

@@ -182,7 +182,7 @@ static inline void tcp_process(struct net_device *dev, struct txq_entry_t *tqe)
 	spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
 }
 
-static int wilc_wlan_txq_filter_dup_tcp_ack(struct net_device *dev)
+static void wilc_wlan_txq_filter_dup_tcp_ack(struct net_device *dev)
 {
 	struct wilc_vif *vif = netdev_priv(dev);
 	struct wilc *wilc = vif->wilc;
@@ -237,8 +237,6 @@ static int wilc_wlan_txq_filter_dup_tcp_ack(struct net_device *dev)
 					    msecs_to_jiffies(1));
 		dropped--;
 	}
-
-	return 1;
 }
 
 void wilc_enable_tcp_ack_filter(struct wilc_vif *vif, bool value)