ASoC: atmel: sam9x5_wm8731: remove platform_set_drvdata

When call snd_soc_register_card, it will set driver data to this
device through dev_set_drvdata, then in driver, no need to call
platform_set_drvdata again, so remove it.
Signed-off-by: NBo Shen <voice.shen@atmel.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/atmel/sam9x5_wm8731.c

@@ -153,8 +153,6 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	of_node_put(codec_np);
 	of_node_put(cpu_np);
 
-	platform_set_drvdata(pdev, card);
-
 	ret = snd_soc_register_card(card);
 	if (ret) {
 		dev_err(&pdev->dev,