rtl818x: fix sparse warnings

This silences a few sparse warnings. There are two more where
I can't follow the code.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtl8187_dev.c b/drivers/net/wireless/rtl8187_dev.c
index 0d71716..f445059 100644
--- a/drivers/net/wireless/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl8187_dev.c
@@ -113,10 +113,12 @@
 
 static void rtl8187_tx_cb(struct urb *urb)
 {
-	struct ieee80211_tx_status status = { {0} };
+	struct ieee80211_tx_status status;
 	struct sk_buff *skb = (struct sk_buff *)urb->context;
 	struct rtl8187_tx_info *info = (struct rtl8187_tx_info *)skb->cb;
 
+	memset(&status, 0, sizeof(status));
+
 	usb_free_urb(info->urb);
 	if (info->control)
 		memcpy(&status.control, info->control, sizeof(status.control));