[ALSA] sound/isa/ad1816a/ad1816a.c: check kmalloc() return value

Check the return value of kmalloc() in function snd_card_ad1816a_pnp(),
in file sound/isa/ad1816a/ad1816a.c.
Signed-off-by: NAmit Choudhary <amit2030@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/isa/ad1816a/ad1816a.c

@@ -120,6 +120,8 @@ static int __devinit snd_card_ad1816a_pnp(int dev, struct snd_card_ad1816a *acar
 	struct pnp_resource_table *cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 	int err;
 
+	if (!cfg)
+		return -ENOMEM;
 	acard->dev = pnp_request_card_device(card, id->devs[0].id, NULL);
 	if (acard->dev == NULL) {
 		kfree(cfg);