[ALSA] Fix invalid schedule_timeout_interruptible()

Fixed the invalid use of schedule_timeout_interruptible() without
checking pending signals.  Simply replaced with schedule_timeout().
Suggestions thanks to Jeff Garzik.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 78020d8..bacc51c 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -1780,7 +1780,7 @@
 	outb (val,port);
 	spin_unlock_irq(&dev->irq_lock);
 	while (1) {
-		if ((timeout = schedule_timeout_interruptible(timeout)) == 0)
+		if ((timeout = schedule_timeout(timeout)) == 0)
 			return;
 		if (dev->irq_ok)
 			return;