wl1251: Send null data packet with "TODS" bit set

According to IEEE80211 standard all the data packets have to be sent with
TODS bit set. This patch fixes the null data packet format which was sent
without TODS bit set. This should fix many problems associated with
power save. Janne Ylalehto also found this fix in the same time as mine,
for a different bug he was working on.

Signed-off-by: Vidhya Govindan <vidhya.govindan@nokia.com>
Reviewed-by: Janne Ylalehto <janne.ylalehto@nokia.com>
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_main.c

@@ -576,7 +576,8 @@ static int wl1251_build_null_data(struct wl1251 *wl)
 
 	memcpy(template.header.sa, wl->mac_addr, ETH_ALEN);
 	template.header.frame_ctl = cpu_to_le16(IEEE80211_FTYPE_DATA |
-						IEEE80211_STYPE_NULLFUNC);
+						IEEE80211_STYPE_NULLFUNC |
+						IEEE80211_FCTL_TODS);
 
 	return wl1251_cmd_template_set(wl, CMD_NULL_DATA, &template,
 				       sizeof(template));