re-fixed XNXX regex problem

youtube_dl/InfoExtractors.py

@@ -3294,7 +3294,7 @@ class YoukuIE(InfoExtractor):
 class XNXXIE(InfoExtractor):
     """Information extractor for xnxx.com"""
 
-    _VALID_URL = r'^http://video\.xnxx\.com/video([0-9]+)/(.*)'
+    _VALID_URL = r'^(?:https?://)?video\.xnxx\.com/video([0-9]+)/(.*)'
     IE_NAME = u'xnxx'
     VIDEO_URL_RE = r'flv_url=(.*?)&'
     VIDEO_TITLE_RE = r'<title>(.*?)\s+-\s+XNXX.COM'