rtlwifi: use pci_zalloc_consistent

Remove the now unnecessary memset too.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Chaoming Li <chaoming_li@realsil.com.cn>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/net/wireless/rtlwifi/pci.c

@@ -1092,16 +1092,14 @@ static int _rtl_pci_init_tx_ring(struct ieee80211_hw *hw,
 	u32 nextdescaddress;
 	int i;
 
-	ring = pci_alloc_consistent(rtlpci->pdev,
-				    sizeof(*ring) * entries, &dma);
-
+	ring = pci_zalloc_consistent(rtlpci->pdev, sizeof(*ring) * entries,
+				     &dma);
 	if (!ring || (unsigned long)ring & 0xFF) {
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 			 "Cannot allocate TX ring (prio = %d)\n", prio);
 		return -ENOMEM;
 	}
 
-	memset(ring, 0, sizeof(*ring) * entries);
 	rtlpci->tx_ring[prio].desc = ring;
 	rtlpci->tx_ring[prio].dma = dma;
 	rtlpci->tx_ring[prio].idx = 0;
@@ -1139,9 +1137,8 @@ static int _rtl_pci_init_rx_ring(struct ieee80211_hw *hw)
 	for (rx_queue_idx = 0; rx_queue_idx < RTL_PCI_MAX_RX_QUEUE;
 	     rx_queue_idx++) {
 		rtlpci->rx_ring[rx_queue_idx].desc =
-		    pci_alloc_consistent(rtlpci->pdev,
-					 sizeof(*rtlpci->rx_ring[rx_queue_idx].
-						desc) * rtlpci->rxringcount,
+			pci_zalloc_consistent(rtlpci->pdev,
+					      sizeof(*rtlpci->rx_ring[rx_queue_idx].desc) * rtlpci->rxringcount,
 					      &rtlpci->rx_ring[rx_queue_idx].dma);
 
 		if (!rtlpci->rx_ring[rx_queue_idx].desc ||
@@ -1151,10 +1148,6 @@ static int _rtl_pci_init_rx_ring(struct ieee80211_hw *hw)
 			return -ENOMEM;
 		}
 
-		memset(rtlpci->rx_ring[rx_queue_idx].desc, 0,
-		       sizeof(*rtlpci->rx_ring[rx_queue_idx].desc) *
-		       rtlpci->rxringcount);
-
 		rtlpci->rx_ring[rx_queue_idx].idx = 0;
 
 		/* If amsdu_8k is disabled, set buffersize to 4096. This