qcacld-3.0: Specify policy for txpower_scale_decr_db

__wlan_hdd_cfg80211_txpower_scale_decr_db() calls nla_parse without
specifying a policy. Specify an nla policy with the expected attribute
information when calling nla_parse in
__wlan_hdd_cfg80211_txpower_scale_decr_db().

Change-Id: I219190726ccb19cb8849177888bca859da1c76db
CRs-Fixed: 2054752

core/hdd/src/wlan_hdd_cfg80211.c

@@ -6947,6 +6947,11 @@ static int wlan_hdd_cfg80211_txpower_scale(struct wiphy *wiphy,
 	return ret;
 }
 
+static const struct nla_policy txpower_scale_decr_db_policy
+[QCA_WLAN_VENDOR_ATTR_TXPOWER_SCALE_DECR_DB_MAX + 1] = {
+	[QCA_WLAN_VENDOR_ATTR_TXPOWER_SCALE_DECR_DB] = { .type = NLA_U8 },
+};
+
 /**
  * __wlan_hdd_cfg80211_txpower_scale_decr_db () - txpower scaling
  * @wiphy: Pointer to wireless phy
@@ -6978,7 +6983,7 @@ static int __wlan_hdd_cfg80211_txpower_scale_decr_db(struct wiphy *wiphy,
 	adapter = WLAN_HDD_GET_PRIV_PTR(dev);
 
 	if (nla_parse(tb, QCA_WLAN_VENDOR_ATTR_TXPOWER_SCALE_DECR_DB_MAX,
-		      data, data_len, NULL)) {
+		      data, data_len, txpower_scale_decr_db_policy)) {
 		hdd_err("Invalid ATTR");
 		return -EINVAL;
 	}