[ALSA] Fix schedule_timeout usage

Use schedule_timeout_{,un}interruptible() instead of
set_current_state()/schedule_timeout() to reduce kernel size.  Also use
human-time conversion functions instead of hard-coded division to avoid
rounding issues.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/mixart/mixart.c

@@ -451,8 +451,7 @@ static int mixart_sync_nonblock_events(mixart_mgr_t *mgr)
 			snd_printk(KERN_ERR "mixart: cannot process nonblock events!\n");
 			return -EBUSY;
 		}
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		schedule_timeout(1);
+		schedule_timeout_uninterruptible(1);
 	}
 	return 0;
 }