net: phy: micrel: drop superfluous use of temp variable

'temp' was used before commit c0c99d0c ("net: phy: micrel: remove
the use of .ack_interrupt()") refactored the code. Now, we can simplify
it a little.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230314124928.44948-1-wsa+renesas@sang-engineering.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/phy/micrel.c

@@ -436,11 +436,9 @@ static int kszphy_config_intr(struct phy_device *phydev)
 		if (err)
 			return err;
 
-		temp = KSZPHY_INTCS_ALL;
-		err = phy_write(phydev, MII_KSZPHY_INTCS, temp);
+		err = phy_write(phydev, MII_KSZPHY_INTCS, KSZPHY_INTCS_ALL);
 	} else {
-		temp = 0;
-		err = phy_write(phydev, MII_KSZPHY_INTCS, temp);
+		err = phy_write(phydev, MII_KSZPHY_INTCS, 0);
 		if (err)
 			return err;