[PATCH] dsa: mv88e6xxx: fix returnvar.cocci warnings

[Julia Lawall <julia.lawall@lip6.fr>]

Remove unneeded variable used to store return value.

Generated by: scripts/coccinelle/misc/returnvar.cocci

CC: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---

It's a minor issue, but since there is no error, the code is a bit
misleading.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
master
head:   47936d35edbac5e58064bd15e51136050b2f2717
commit: 04aca9938255fc7097b3fb5700f408524656f2e2 [330/362] dsa: mv88e6xxx:
Enable/Disable SERDES on port enable/disable

 chip.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1982,13 +1982,12 @@ static int mv88e6xxx_port_enable(struct
 				 struct phy_device *phydev)
 {
 	struct mv88e6xxx_chip *chip = ds->priv;
-	int err = 0;

 	mutex_lock(&chip->reg_lock);
 	mv88e6xxx_serdes_power(chip, port, true);
 	mutex_unlock(&chip->reg_lock);

-	return err;
+	return 0;
 }

 static void mv88e6xxx_port_disable(struct dsa_switch *ds, int port,