diff -r 57a017f79e96 -r bb72031f0ea8 mercurial/changegroup.py
--- a/mercurial/changegroup.py	Thu Jul 13 21:10:55 2017 +0200
+++ b/mercurial/changegroup.py	Thu Jul 13 21:08:06 2017 +0200
@@ -412,7 +412,7 @@
             ret = deltaheads - 1
         else:
             ret = deltaheads + 1
-        return ret, added
+        return ret
 
 class cg2unpacker(cg1unpacker):
     """Unpacker for cg2 streams.