irda: use pci_zalloc_consistent

Remove the now unnecessary memset too.
Signed-off-by: NJoe Perches <joe@perches.com>
Cc: Samuel Ortiz <samuel@sortiz.org>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/net/irda/vlsi_ir.c

@@ -485,13 +485,13 @@ static int vlsi_create_hwif(vlsi_irda_dev_t *idev)
 	idev->virtaddr = NULL;
 	idev->busaddr = 0;
 
-	ringarea = pci_alloc_consistent(idev->pdev, HW_RING_AREA_SIZE, &idev->busaddr);
+	ringarea = pci_zalloc_consistent(idev->pdev, HW_RING_AREA_SIZE,
+					 &idev->busaddr);
 	if (!ringarea) {
 		IRDA_ERROR("%s: insufficient memory for descriptor rings\n",
 			   __func__);
 		goto out;
 	}
-	memset(ringarea, 0, HW_RING_AREA_SIZE);
 
 	hwmap = (struct ring_descr_hw *)ringarea;
 	idev->rx_ring = vlsi_alloc_ring(idev->pdev, hwmap, ringsize[1],