ath9k_htc: Fix RX length check

The length of the received SKB could be equal to
HTC_RX_FRAME_HEADER_SIZE in case of packets with phy/crc errors,
in which case they are dropped without being processed.
Fix this check so that the error counters are updated correctly.
Signed-off-by: NSujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

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

@@ -525,8 +525,9 @@ static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 	int last_rssi = ATH_RSSI_DUMMY_MARKER;
 	__le16 fc;
 
-	if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
-		ath_err(common, "Corrupted RX frame, dropping\n");
+	if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
+		ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
+			skb->len);
 		goto rx_next;
 	}