staging: iio: lpc32xx_adc: Remove redundant platform_set_drvdata()

Commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Roland Stigge <stigge@antcom.de>
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/lpc32xx_adc.c

@@ -215,7 +215,6 @@ static int lpc32xx_adc_remove(struct platform_device *pdev)
 
 	iio_device_unregister(iodev);
 	free_irq(irq, info);
-	platform_set_drvdata(pdev, NULL);
 	clk_put(info->clk);
 	iounmap(info->adc_base);
 	iio_device_free(iodev);