micrel: fix masking off LED bits

Commit 20d8435a (phy: micrel: add of configuration for LED mode) made the
obvious mistake when masking off  the LED mode bits: forgot to do a logical NOT
to the mask with which it ANDs the register value, so that unrelated bits are
cleared instead.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/micrel.c

@@ -167,7 +167,7 @@ static int kszphy_setup_led(struct phy_device *phydev,
 	if (temp < 0)
 		return temp;
 
-	temp &= 3 << shift;
+	temp &= ~(3 << shift);
 	temp |= val << shift;
 	rc = phy_write(phydev, reg, temp);