Fix possible missing parameter in playlist url extraction

The "playlist_prefix" parameter was missing when parsing playlist urls
that match the recently added format, e.g.:
http://www.youtube.com/user/stanforduniversity#g/c/9D558D49CA734A02
For these URLs (basically, for every playlist type so far, except the
artist list) playlist_prefix has to be equal to "p" for correct
exctraction.

diff --git a/youtube-dl b/youtube-dl
index 0f97246..26af2e5 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -2135,6 +2135,7 @@ class YoutubePlaylistIE(InfoExtractor):
                if playlist_prefix == 'a':
                        playlist_access = 'artist'
                else:
+                       playlist_prefix = 'p'
                        playlist_access = 'view_play_list'
                playlist_id = mobj.group(2)
                video_ids = []