[youtube] Remove unused variable

youtube_dl/extractor/youtube.py

@@ -1386,7 +1386,6 @@ class YoutubeChannelIE(InfoExtractor):
     def _real_extract(self, url):
         channel_id = self._match_id(url)
 
-        video_ids = []
         url = 'https://www.youtube.com/channel/%s/videos' % channel_id
         channel_page = self._download_webpage(url, channel_id)
         autogenerated = re.search(r'''(?x)