drivers:net: fix return value check in ocelot_fdma_receive_skb

ocelot_fdma_receive_skb should return false if an unexpected
value is returned by pskb_trim.

Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: AnnYugawa

drivers/net/ethernet/mscc/ocelot_fdma.c

@@ -368,7 +368,8 @@ static bool ocelot_fdma_receive_skb(struct ocelot *ocelot, struct sk_buff *skb)
 	if (unlikely(!ndev))
 		return false;
 
-	pskb_trim(skb, skb->len - ETH_FCS_LEN);
+	if (pskb_trim(skb, skb->len - ETH_FCS_LEN))
+		return false;
 
 	skb->dev = ndev;
 	skb->protocol = eth_type_trans(skb, skb->dev);