net: ethernet: ti: cpsw: fix error return code in cpsw_set_channels()

Fix to return a negative error code from the cpsw_fill_rx_channels()
error handling case instead of 0, as done elsewhere in this function.

Fixes: ce52c744 ("net: ethernet: ti: cpsw: add ethtool channels support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -2217,7 +2217,8 @@ static int cpsw_set_channels(struct net_device *ndev,
 	}
 
 	if (cpsw_common_res_usage_state(cpsw)) {
-		if (cpsw_fill_rx_channels(priv))
+		ret = cpsw_fill_rx_channels(priv);
+		if (ret)
 			goto err;
 
 		/* After this receive is started */