ALSA: azt3328 - Fix NULL ptr dereference on cards without OPL3

opl3->private_data was set even if opl3 could not be created.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/azt3328.c b/sound/pci/azt3328.c
index 95ffa6a..496f14c 100644
--- a/sound/pci/azt3328.c
+++ b/sound/pci/azt3328.c
@@ -2684,10 +2684,9 @@
 		err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
 		if (err < 0)
 			goto out_err;
+		opl3->private_data = chip;
 	}
 
-	opl3->private_data = chip;
-
 	sprintf(card->longname, "%s at 0x%lx, irq %i",
 		card->shortname, chip->ctrl_io, chip->irq);