playlistfs didn't set volume properly.

Reference: /n/atom/patch/applied/playlistfsvol
Date: Tue Mar 18 05:43:23 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/games/music/playlistfs/volume.c	Tue Mar 18 05:42:45 2014
+++ /sys/src/games/music/playlistfs/volume.c	Tue Mar 18 05:42:46 2014
@@ -65,27 +65,14 @@
 void
 volumeset(int *v)
 {
-	int fd, i;
-	char buf[256], *p;
+	int fd;
 
-	fd = open("/dev/audioctl", OWRITE);
+	fd = open("/dev/volume", OWRITE);
 	if (fd < 0){
-		fd = open("/dev/volume", OWRITE);
-		if (fd < 0){
-			fprint(2, "Can't set volume: %r");
-			return;
-		}
-		fprint(fd, "audio out %d",  v[0]);
-		send(volumechan, v);
-	} else {
-		p = buf;
-		for (i = 0; i < 8; i++){
-			if (v[i] == Undef) break;
-			p = seprint(p, buf+sizeof buf, (p==buf)?"volume out '%d":" %d",
-				minvolume + v[i] * (maxvolume-minvolume) / 100);
-		}
-		p = seprint(p, buf+sizeof buf, "'\n");
-		write(fd, buf, p-buf);
+		fprint(2, "Can't set volume: %r");
+		return;
 	}
+	fprint(fd, "%d",  v[0]);
+	send(volumechan, v);
 	close(fd);
 }