ALSA: ml403-ac97cr: 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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/drivers/ml403-ac97cr.c b/sound/drivers/ml403-ac97cr.c
index 8125a7e..95ea4a1 100644
--- a/sound/drivers/ml403-ac97cr.c
+++ b/sound/drivers/ml403-ac97cr.c
@@ -1325,7 +1325,6 @@
 static int snd_ml403_ac97cr_remove(struct platform_device *pfdev)
 {
 	snd_card_free(platform_get_drvdata(pfdev));
-	platform_set_drvdata(pfdev, NULL);
 	return 0;
 }