net: dm9051: Use PTR_ERR_OR_ZERO() to simplify code

Use the standard error pointer macro to shorten the code and simplify.
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Link: https://lore.kernel.org/r/20230822021455.205101-2-liaoyu15@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/davicom/dm9051.c

@@ -1158,9 +1158,7 @@ static int dm9051_phy_connect(struct board_info *db)
 
 	db->phydev = phy_connect(db->ndev, phy_id, dm9051_handle_link_change,
 				 PHY_INTERFACE_MODE_MII);
-	if (IS_ERR(db->phydev))
 	return PTR_ERR_OR_ZERO(db->phydev);
-	return 0;
 }
 
 static int dm9051_probe(struct spi_device *spi)