ALSA: cmi8330: Allow MPU-401-less operation

Adding MPU-401 support to cmi8330 driver could cause a regression (non-working
sound) on a system where there is no free IRQ for the MPU-401 device (which
is not very uncommon as this card requires two separate IRQs plus a third one
for MPU-401).

When MPU-401 PnP configuration fails (mostly because of unavailable IRQ), just
ignore MPU-401 and continue without it.
Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/cmi8330.c

@@ -389,12 +389,12 @@ static int __devinit snd_cmi8330_pnp(int dev, struct snd_cmi8330 *acard,
 	pdev = acard->mpu;
 
 	err = pnp_activate_dev(pdev);
-	if (err < 0) {
-		snd_printk(KERN_ERR "MPU-401 PnP configure failure\n");
-		return -EBUSY;
-	}
+	if (err < 0)
+		snd_printk(KERN_ERR "MPU-401 PnP configure failure: will be disabled\n");
+	else {
 		mpuport[dev] = pnp_port_start(pdev, 0);
 		mpuirq[dev] = pnp_irq(pdev, 0);
+	}
 	return 0;
 }
 #endif