wil6210: fix RX short frame check

The short frame check in wil_sring_reap_rx_edma uses
skb->len which store the maximum frame length. Fix
this to use dmalen which is the actual length of
the received frame.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/txrx_edma.c

@@ -964,8 +964,8 @@ static struct sk_buff *wil_sring_reap_rx_edma(struct wil6210_priv *wil,
 	}
 	stats = &wil->sta[cid].stats;
 
-	if (unlikely(skb->len < ETH_HLEN)) {
-		wil_dbg_txrx(wil, "Short frame, len = %d\n", skb->len);
+	if (unlikely(dmalen < ETH_HLEN)) {
+		wil_dbg_txrx(wil, "Short frame, len = %d\n", dmalen);
 		stats->rx_short_frame++;
 		rxdata->skipping = true;
 		goto skipping;