mfd: tps80031: Add terminating entry for tps80031_id_table

The i2c_device_id table is supposed to be zero-terminated.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/tps80031.c

@@ -543,6 +543,7 @@ static int __devexit tps80031_remove(struct i2c_client *client)
 static const struct i2c_device_id tps80031_id_table[] = {
 	{ "tps80031", TPS80031 },
 	{ "tps80032", TPS80032 },
+	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tps80031_id_table);