[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>
diff --git a/sound/isa/gus/gus_pcm.c b/sound/isa/gus/gus_pcm.c
index 720c073..1cc89fb 100644
--- a/sound/isa/gus/gus_pcm.c
+++ b/sound/isa/gus/gus_pcm.c
@@ -333,8 +333,7 @@
 			}
 		}
 		if (count > 0 && !in_interrupt()) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			schedule_timeout(1);
+			schedule_timeout_interruptible(1);
 			if (signal_pending(current))
 				return -EAGAIN;
 		}