qcacld-3.0: Fix RX MCS invalid

Sometimes the RX MCS index obtained from RX MSDU END is an
invalid value. From SW's perspective, the invalid value should
be disposed of. This change will handle the invalid MCS index.

Change-Id: Iba35889fa4c5ed0d0bbea4a38b5375c1197cdd37
CRs-Fixed: 3368064

core/hdd/src/wlan_hdd_stats.c

@@ -6292,8 +6292,10 @@ static int wlan_hdd_get_sta_stats(struct wiphy *wiphy,
 
 		if (tx_mcs_index == INVALID_MCS_IDX)
 			tx_mcs_index = 0;
-		if (rx_mcs_index == INVALID_MCS_IDX)
+		if (rx_mcs_index == INVALID_MCS_IDX) {
 			rx_mcs_index = 0;
+			adapter->hdd_stats.class_a_stat.rx_mcs_index = 0;
+		}
 	}
 
 	hdd_debug("[RSSI %d, RLMS %u, rssi high %d, rssi mid %d, rssi low %d]-"