ath10k: use octal permission representation

Fix output from checkpatch.pl like:
 Symbolic permissions 'S_IRUSR' are not preferred.
 Consider using octal permissions '0400'.

Signed-off-by: Marcin Rokicki <marcin.rokicki@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath10k/thermal.c b/drivers/net/wireless/ath/ath10k/thermal.c
index f719d7d..87948af 100644
--- a/drivers/net/wireless/ath/ath10k/thermal.c
+++ b/drivers/net/wireless/ath/ath10k/thermal.c
@@ -124,7 +124,7 @@ void ath10k_thermal_event_temperature(struct ath10k *ar, int temperature)
 	complete(&ar->thermal.wmi_sync);
 }
 
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ath10k_thermal_show_temp,
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, ath10k_thermal_show_temp,
 			  NULL, 0);
 
 static struct attribute *ath10k_hwmon_attrs[] = {