staging: wilc1000: use ENOBUFS error code instead of WILC_TX_ERR_NO_BUF macro

Make use of 'ENOBUFS' instead of WILC_TX_ERR_NO_BUF macro. The value of
WILC_TX_ERR_NO_BUF is -2, which is confusing with ENOENT error code.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_wlan.c

@@ -242,7 +242,7 @@ static int linux_wlan_txq_task(void *vp)
 				if (netif_queue_stopped(wl->vif[1]->ndev))
 					netif_wake_queue(wl->vif[1]->ndev);
 			}
-		} while (ret == WILC_TX_ERR_NO_BUF && !wl->close);
+		} while (ret == -ENOBUFS && !wl->close);
 	}
 	return 0;
 }

drivers/staging/wilc1000/wilc_wlan.c

@@ -611,7 +611,7 @@ int wilc_wlan_handle_txq(struct net_device *dev, u32 *txq_count)
 		goto out_release_bus;
 
 	if (entries == 0) {
-		ret = WILC_TX_ERR_NO_BUF;
+		ret = -ENOBUFS;
 		goto out_release_bus;
 	}
 

drivers/staging/wilc1000/wilc_wlan_if.h

@@ -41,8 +41,6 @@ struct tx_complete_data {
 
 typedef void (*wilc_tx_complete_func_t)(void *, int);
 
-#define WILC_TX_ERR_NO_BUF	(-2)
-
 /********************************************
  *
  *      Wlan Configuration ID