Fix undefined name.

anntzer · anntzer · commit d610a5dac4b0 · 2018-03-15T15:03:59.000-07:00
diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
@@ -1342,7 +1342,8 @@ def to_html5_video(self, embed_limit=None):
                 # Now open and base64 encode.
                 vid64 = base64.encodebytes(path.read_bytes())
 
-            if len(vid64) >= embed_limit:
+            vid_len = len(vid64)
+            if vid_len >= embed_limit:
                 _log.warning(
                     "Animation movie is %s bytes, exceeding the limit of %s. "
                     "If you're sure you want a large animation embedded, set "
