spi: gpio: Make sure spi_master_put() is called in every error path

There's a number of failure paths in spi_gpio_probe() that do not call
spi_master_put() potentially leaking memory. Fix this problem by
registering a cleanup funciont via devm_add_action_or_reset() right
after SPI controller is allocated.

Signed-off-by: Andrey Smirnov <[e-mail]>
Cc: Mark Brown <[e-mail]>
Cc: Chris Healy <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-gpio.c

···
 	return 0;
 }
 
+static void spi_gpio_put(void *data)
+{
+	spi_master_put(data);
+}
+
 static int spi_gpio_probe(struct platform_device *pdev)
 {
 	int				status;
···
 	master = spi_alloc_master(dev, sizeof(*spi_gpio));
 	if (!master)
 		return -ENOMEM;
+
+	status = devm_add_action_or_reset(&pdev->dev, spi_gpio_put, master);
+	if (status)
+		return status;
 
 	if (of_id)
 		status = spi_gpio_probe_dt(pdev, master);
···
 	}
 	bb->setup_transfer = spi_bitbang_setup_transfer;
 
-	status = spi_bitbang_start(&spi_gpio->bitbang);
-	if (status)
-		spi_master_put(master);
-
-	return status;
+	return spi_bitbang_start(&spi_gpio->bitbang);
 }
 
 static int spi_gpio_remove(struct platform_device *pdev)
···
 
 	/* stop() unregisters child devices too */
 	spi_bitbang_stop(&spi_gpio->bitbang);
-
-	spi_master_put(spi_gpio->bitbang.master);
 
 	return 0;
 }