zd1211rw: Replace ZD_CS_MULTICAST with ZD_CS_NO_ACK

According to my tests, all that ZD_CS_MULTICAST does is to
disable retrying/waiting for an ACK. Reflect this by renaming
the bit to ZD_CS_NO_ACK and setting it based on
IEEE80211_TX_CTL_NO_ACK, instead of is_multicast_ether_addr.
Signed-off-by: Gábor Stefanik <netrolller.3d@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -420,9 +420,9 @@ static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 	if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 		cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 
-	/* Multicast */
-	if (is_multicast_ether_addr(header->addr1))
-		cs->control |= ZD_CS_MULTICAST;
+	/* No ACK expected (multicast, etc.) */
+	if (info->flags & IEEE80211_TX_CTL_NO_ACK)
+		cs->control |= ZD_CS_NO_ACK;
 
 	/* PS-POLL */
 	if (ieee80211_is_pspoll(header->frame_control))

drivers/net/wireless/zd1211rw/zd_mac.h

@@ -87,7 +87,7 @@ struct zd_ctrlset {
 
 /* zd_ctrlset control field */
 #define ZD_CS_NEED_RANDOM_BACKOFF	0x01
-#define ZD_CS_MULTICAST			0x02
+#define ZD_CS_NO_ACK			0x02
 
 #define ZD_CS_FRAME_TYPE_MASK		0x0c
 #define ZD_CS_DATA_FRAME		0x00