Fix os.makedirs in Windows

diff --git a/youtube-dl b/youtube-dl
index cc6462c..153d413 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -711,7 +711,9 @@ class FileDownloader(object):
                        return
 
                try:
-                       os.makedirs(os.path.dirname(filename))
+                       dn = os.path.dirname(filename)
+                       if dn != '' and not os.path.exists(dn):
+                               os.makedirs(dn)
                except (OSError, IOError), err:
                        self.trouble(u'ERROR: unable to create directories: %s' % str(err))
                        return