spi: gpio: Drop unused pdev field in struct spi_gpio

There's no code using 'pdev' field in struct spi_gpio. Drop it.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Chris Healy <cphealy@gmail.com>
Cc: linux-spi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-gpio.c

@@ -41,7 +41,6 @@
 
 struct spi_gpio {
 	struct spi_bitbang		bitbang;
-	struct platform_device		*pdev;
 	struct gpio_desc		*sck;
 	struct gpio_desc		*miso;
 	struct gpio_desc		*mosi;
@@ -390,8 +389,6 @@ static int spi_gpio_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, spi_gpio);
 
-	spi_gpio->pdev = pdev;
-
 	status = spi_gpio_request(dev, spi_gpio);
 	if (status)
 		return status;