net: ep93xx_eth: Delete unnecessary checks before the function call "kfree"

The kfree() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cirrus/ep93xx_eth.c

@@ -475,8 +475,7 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep)
 		if (d)
 			dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
 
-		if (ep->rx_buf[i] != NULL)
-			kfree(ep->rx_buf[i]);
+		kfree(ep->rx_buf[i]);
 	}
 
 	for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
@@ -486,8 +485,7 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep)
 		if (d)
 			dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
 
-		if (ep->tx_buf[i] != NULL)
-			kfree(ep->tx_buf[i]);
+		kfree(ep->tx_buf[i]);
 	}
 
 	dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,