[ALSA] sound/isa/opti9xx/opti92x-ad1848.c: check kmalloc() return value

Check the return value of kmalloc() in function snd_card_opti9xx_pnp(),
in file sound/isa/opti9xx/opti92x-ad1848.c.
Signed-off-by: Amit Choudhary <amit2030@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/isa/opti9xx/opti92x-ad1848.c

@@ -1683,6 +1683,8 @@ static int __init snd_card_opti9xx_pnp(struct snd_opti9xx *chip, struct pnp_card
 	struct pnp_resource_table *cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 	int err;
 
+	if (!cfg)
+		return -ENOMEM;
 	chip->dev = pnp_request_card_device(card, pid->devs[0].id, NULL);
 	if (chip->dev == NULL) {
 		kfree(cfg);