cleanup: make automv pass check-code

Summary: This will make it easier to move it into core

Test Plan: All the tests that passed before are still passing

Reviewers: #sourcecontrol, ttung

Differential Revision: https://phabricator.fb.com/D2788061

automv.py

@@ -80,6 +80,6 @@ def _markchanges(repo, renames):
         for dst, src in renames.iteritems():
             wctx.copy(src, dst)
     finally:
-       wlock.release()
+        wlock.release()