ALSA: sh: aica: Remove redundant platform_set_drvdata()

Commit 0998d063 (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: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/sh/aica.c

@@ -598,7 +598,6 @@ static int snd_aica_remove(struct platform_device *devptr)
 		return -ENODEV;
 	snd_card_free(dreamcastcard->card);
 	kfree(dreamcastcard);
-	platform_set_drvdata(devptr, NULL);
 	return 0;
 }