[gnome-music] Ensure that there is a timeout before removing it on button press

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit 6d4c0be1eae7d54878a8dee2e1da89dfdb2d1762
Author: Arnel A. Borja <kyoushuu yahoo com>
Date:   Wed Jun 5 23:54:05 2013 +0800

    Ensure that there is a timeout before removing it on button press
    
    https://bugzilla.gnome.org/show_bug.cgi?id=701658

 src/player.js |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/player.js b/src/player.js
index 18c4b05..c341e12 100644
--- a/src/player.js
+++ b/src/player.js
@@ -320,7 +320,10 @@ const Player = new Lang.Class({
                 this._lastState = this.player.get_state(1)[1];
                 this.player.set_state(Gst.State.PAUSED);
                 this._updatePositionCallback();
-                GLib.source_remove(this.timeout);
+                if (this.timeout) {
+                    GLib.source_remove(this.timeout);
+                    this.timeout = null;
+                }
                 return false;
             }));
         this.progressScale.connect("value-changed", Lang.bind(this,