rtlwifi: use eth_zero_addr() to assign zero address

Using eth_zero_addr() to assign zero address insetad of
memset() or an inefficient copy from a static array.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtlwifi/cam.c b/drivers/net/wireless/rtlwifi/cam.c
index ca69e35..0e510f7 100644
--- a/drivers/net/wireless/rtlwifi/cam.c
+++ b/drivers/net/wireless/rtlwifi/cam.c
@@ -337,7 +337,7 @@
 		if (((bitmap & BIT(0)) == BIT(0)) &&
 		    (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 			/* Remove from HW Security CAM */
-			memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
+			eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 			rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "del CAM entry %d\n", i);