[ALSA] Remove IRQF_DISABLED for shared PCI irqs

Fix IRQ flags for PCI devices.
The shared IRQs for PCI devices shouldn't be allocated with
IRQF_DISABLED.  Also, when MSI is enabled, IRQF_SHARED shouldn't
be used.
The patch removes unnecessary cast in request_irq and free_irq,
too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
index 945d21b..879e31a 100644
--- a/sound/pci/nm256/nm256.c
+++ b/sound/pci/nm256/nm256.c
@@ -465,7 +465,7 @@
 {
 	mutex_lock(&chip->irq_mutex);
 	if (chip->irq < 0) {
-		if (request_irq(chip->pci->irq, chip->interrupt, IRQF_DISABLED|IRQF_SHARED,
+		if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
 				chip->card->driver, chip)) {
 			snd_printk(KERN_ERR "unable to grab IRQ %d\n", chip->pci->irq);
 			mutex_unlock(&chip->irq_mutex);