spi: sc18is602: Don't leak SPI master in probe error path

commit 5b8c884 upstream.

If the call to devm_gpiod_get_optional() fails on probe of the NXP
SC18IS602/603 SPI driver, the spi_master struct is erroneously not freed.

Fix by switching over to the new devm_spi_alloc_master() helper.

Fixes: f990080 ("spi: sc18is602: Add reset control via gpio pin.")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v4.9+: 5e844cc: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v4.9+
Cc: Phil Reid <preid@electromag.com.au>
Link: https://lore.kernel.org/r/d5f715527b894b91d530fe11a86f51b3184a4e1a.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/spi/spi-sc18is602.c

@@ -238,13 +238,12 @@ static int sc18is602_probe(struct i2c_client *client,
 	struct sc18is602_platform_data *pdata = dev_get_platdata(dev);
 	struct sc18is602 *hw;
 	struct spi_master *master;
-	int error;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 		return -EINVAL;
 
-	master = spi_alloc_master(dev, sizeof(struct sc18is602));
+	master = devm_spi_alloc_master(dev, sizeof(struct sc18is602));
 	if (!master)
 		return -ENOMEM;
 
@@ -298,15 +297,7 @@ static int sc18is602_probe(struct i2c_client *client,
 	master->min_speed_hz = hw->freq / 128;
 	master->max_speed_hz = hw->freq / 4;
 
-	error = devm_spi_register_master(dev, master);
-	if (error)
-		goto error_reg;
-
-	return 0;
-
-error_reg:
-	spi_master_put(master);
-	return error;
+	return devm_spi_register_master(dev, master);
 }
 
 static const struct i2c_device_id sc18is602_id[] = {