mfd: Add terminating entry for i2c_device_id palmas table

The i2c_device_id table is supposed to be zero-terminated.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/palmas.c

@@ -472,6 +472,7 @@ static const struct i2c_device_id palmas_i2c_id[] = {
 	{ "twl6035", },
 	{ "twl6037", },
 	{ "tps65913", },
+	{ /* end */ }
 };
 MODULE_DEVICE_TABLE(i2c, palmas_i2c_id);