ath9k_htc: Fix WMI command race

My patch "ath9k_htc: Handle WMI timeouts properly" introduced
a race condition in WMI command processing. The last issued command
should be stored _before_ issuing a WMI command. Not doing this
would result in the WMI event IRQ dropping correct command responses
as invalid.

Fix this race by storing the command id correctly.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -305,14 +305,14 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 	wmi->cmd_rsp_buf = rsp_buf;
 	wmi->cmd_rsp_len = rsp_len;
 
-	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
-	if (ret)
-		goto out;
-
 	spin_lock_irqsave(&wmi->wmi_lock, flags);
 	wmi->last_cmd_id = cmd_id;
 	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 
+	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
+	if (ret)
+		goto out;
+
 	time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 	if (!time_left) {
 		ath_print(common, ATH_DBG_WMI,