mfd: palmas: Drop kfree of devm_kzalloc's data

Using kfree to free data allocated with devm_kzalloc causes double frees.

The semantic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x;
@@

x = devm_kzalloc(...)
...
?-kfree(x);
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/palmas.c

@@ -464,7 +464,6 @@ static int __devinit palmas_i2c_probe(struct i2c_client *i2c,
 
 err:
 	mfd_remove_devices(palmas->dev);
-	kfree(palmas);
 	return ret;
 }