atheros: fix return value check in atl1_tso()

in atl1_tso(), it should check the return value of pskb_trim(),
and return an error code if an unexpected value is returned
by pskb_trim().

Fixes: 401c0aa ("atl1: simplify tx packet descriptor")
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Link: https://lore.kernel.org/r/20230722142511.12448-1-ruc_gongyuanjun@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: AnnYugawa

drivers/net/ethernet/atheros/atlx/atl1.c

@@ -2113,8 +2113,11 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
 
 			real_len = (((unsigned char *)iph - skb->data) +
 				ntohs(iph->tot_len));
-			if (real_len < skb->len)
-				pskb_trim(skb, real_len);
+			if (real_len < skb->len) {
+				err = pskb_trim(skb, real_len);
+				if (err)
+					return err;
+			}
 			hdr_len = skb_tcp_all_headers(skb);
 			if (skb->len == hdr_len) {
 				iph->check = 0;