diff -r 9a6b409b8ebc -r 9003e6524f78 mercurial/changelog.py
--- a/mercurial/changelog.py	Tue Sep 15 10:55:17 2020 +0200
+++ b/mercurial/changelog.py	Tue Sep 15 10:49:50 2020 +0200
@@ -305,7 +305,7 @@
         if self._changes is not None:
             return self._changes
         if self._cpsd:
-            changes = metadata.decode_files_sidedata(self, self._sidedata)
+            changes = metadata.decode_files_sidedata(self._sidedata)
         else:
             changes = metadata.ChangingFiles(
                 touched=self.files or (),