ALSA: sh: aica: 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 <[e-mail]>
Cc: Adrian McMenamin <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/sh/aica.c

···
 		return -ENODEV;
 	snd_card_free(dreamcastcard->card);
 	kfree(dreamcastcard);
-	platform_set_drvdata(devptr, NULL);
 	return 0;
 }