dirstate: stop checking for path collision when adjusting parents

This was already checked at a earlier point when adding the file.

Differential Revision: https://phab.mercurial-scm.org/D11504

mercurial/dirstate.py

@@ -408,7 +408,6 b' class dirstate(object):'
                     source = self._map.copymap.get(f)
                     if source:
                         copies[f] = source
-                    self._check_new_tracked_filename(f)
                     self._map.reset_state(
                         f,
                         p1_tracked=False,