ALSA: mips/hal2: 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>
Cc: Thomas Bogendoerfer <tsbogend@alpha.fanken.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/mips/hal2.c

@@ -922,7 +922,6 @@ static int hal2_remove(struct platform_device *pdev)
 	struct snd_card *card = platform_get_drvdata(pdev);
 
 	snd_card_free(card);
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 }