[pitivi] previewers: hardcoded path manipulations are bad.

[Thibault Saunier <tsaunier src gnome org>]

commit 370a7cbd47f2e097d39f8a2b570279af2c0f7027
Author: Mathieu Duponchelle <mathieu duponchelle opencreed com>
Date:   Fri May 2 18:01:09 2014 +0200

    previewers: hardcoded path manipulations are bad.
    
    And I should feel bad.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739251

 pitivi/timeline/previewers.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/previewers.py b/pitivi/timeline/previewers.py
index 8f8b4e3..bff2401 100644
--- a/pitivi/timeline/previewers.py
+++ b/pitivi/timeline/previewers.py
@@ -771,7 +771,7 @@ class AudioPreviewer(Clutter.Actor, PreviewGenerator, Zoomable, Loggable):
         self.log('Preparing waveforms for "%s"' % filename_from_uri(self._uri))
         filename = hash_file(Gst.uri_get_location(self._uri)) + ".wave"
         cache_dir = get_dir(os.path.join(xdg_cache_home(), "waves"))
-        filename = cache_dir + "/" + filename
+        filename = os.path.join(cache_dir, filename)
 
         if os.path.exists(filename):
             self.samples = pickle.load(open(filename, "rb"))