net: phy: marvell: use assignment by bitwise AND operator

Use the &= operator instead of
  ret = ret & ...
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/marvell.c

@@ -2352,7 +2352,7 @@ static int m88e6390_get_temp(struct phy_device *phydev, long *temp)
 	if (ret < 0)
 		goto error;
 
-	ret = ret & ~MII_88E6390_MISC_TEST_TEMP_SENSOR_MASK;
+	ret &= ~MII_88E6390_MISC_TEST_TEMP_SENSOR_MASK;
 	ret |= MII_88E6390_MISC_TEST_TEMP_SENSOR_ENABLE_SAMPLE_1S;
 
 	ret = __phy_write(phydev, MII_88E6390_MISC_TEST, ret);