mkogg.py: Fix 'self.get_mp4_metadata(self, source)'

The bug snuck in with abe5f261 (mkogg.py: Update to Python 3,
2015-07-13).

diff --git a/posts/mkogg/mkogg.py b/posts/mkogg/mkogg.py
index 378906a784a8e2722237fbe9da876ebaa70b0883..9d423b689de5ba0e47e6c4ab4484103d285f55a5 100755 (executable)
--- a/posts/mkogg/mkogg.py
+++ b/posts/mkogg/mkogg.py
@@ -353,7 +353,7 @@ class Converter (object):
         return _mutagen_flac.FLAC(source)
 
     def get_m4a_metadata(self, source):
-        return self.get_mp4_metadata(self, source)
+        return self.get_mp4_metadata(source)
 
     def get_mp3_metadata(self, source):
         if _mutagen is None: