zd1211rw: fix sparse warnings

This silences sparse when run on zd1211rw.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -360,11 +360,14 @@ void zd_mac_tx_failed(struct ieee80211_hw *hw)
 {
 	struct sk_buff_head *q = &zd_hw_mac(hw)->ack_wait_queue;
 	struct sk_buff *skb;
-	struct ieee80211_tx_status status = {{0}};
+	struct ieee80211_tx_status status;
 
 	skb = skb_dequeue(q);
 	if (skb == NULL)
 		return;
+
+	memset(&status, 0, sizeof(status));
+
 	tx_status(hw, skb, &status, 0);
 }
 
@@ -389,7 +392,8 @@ void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
 		if (unlikely(error ||
 		    (cb->control->flags & IEEE80211_TXCTL_NO_ACK)))
 		{
-			struct ieee80211_tx_status status = {{0}};
+			struct ieee80211_tx_status status;
+			memset(&status, 0, sizeof(status));
 			tx_status(hw, skb, &status, !error);
 		} else {
 			struct sk_buff_head *q =
@@ -603,7 +607,9 @@ static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
 		tx_hdr = (struct ieee80211_hdr *)skb->data;
 		if (likely(!compare_ether_addr(tx_hdr->addr2, rx_hdr->addr1)))
 		{
-			struct ieee80211_tx_status status = {{0}};
+			struct ieee80211_tx_status status;
+
+			memset(&status, 0, sizeof(status));
 			status.flags = IEEE80211_TX_STATUS_ACK;
 			status.ack_signal = stats->ssi;
 			__skb_unlink(skb, q);