net: phy: simplify a check in phy_check_link_status

Handling case err == 0 in the other branch allows to simplify the
code. In addition I assume in "err & phydev->eee_cfg.tx_lpi_enabled"
it should have been a logical and operator. It works as expected also
with the bitwise and, but using a bitwise and with a bool value looks
ugly to me.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/de37bf30-61dd-49f9-b645-2d8ea11ddb5d@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/phy.c

@@ -985,10 +985,10 @@ static int phy_check_link_status(struct phy_device *phydev)
 		phydev->state = PHY_RUNNING;
 		err = genphy_c45_eee_is_active(phydev,
 					       NULL, NULL, NULL);
-		if (err < 0)
+		if (err <= 0)
 			phydev->enable_tx_lpi = false;
 		else
-			phydev->enable_tx_lpi = (err & phydev->eee_cfg.tx_lpi_enabled);
+			phydev->enable_tx_lpi = phydev->eee_cfg.tx_lpi_enabled;
 
 		phy_link_up(phydev);
 	} else if (!phydev->link && phydev->state != PHY_NOLINK) {