ath6kl: Fix bug in scheduling hb_timer

hb_timer should be scheduled only when hb_poll is non-zero.
But in ath6kl_recovery_work() the timer is scheduled based
on fw_recovery.enable instead which is wrong.
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/recovery.c

@@ -34,7 +34,7 @@ static void ath6kl_recovery_work(struct work_struct *work)
 
 	ar->fw_recovery.err_reason = 0;
 
-	if (ar->fw_recovery.enable)
+	if (ar->fw_recovery.hb_poll)
 		mod_timer(&ar->fw_recovery.hb_timer, jiffies +
 			  msecs_to_jiffies(ar->fw_recovery.hb_poll));
 }