ath9k_htc: Avoid setting QoS control for non-QoS frames

Setting tid information in the TX header is required only for QoS
frames. Not handling this case causes severe data loss with some APs.

Cc: [e-mail]
Signed-off-by: Rajkumar Manoharan <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

···
 			tx_hdr.data_type = ATH9K_HTC_NORMAL;
 		}
 
-		if (ieee80211_is_data(fc)) {
+		if (ieee80211_is_data_qos(fc)) {
 			qc = ieee80211_get_qos_ctl(hdr);
 			tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 		}