dirstate: drop duplicated check

This is covered by the `@requires_parents_change` decorator that this function use.

Differential Revision: https://phab.mercurial-scm.org/D11125

mercurial/dirstate.py

@@ -560,9 +560,6 b' class dirstate(object):'
         depending of what information ends up being relevant and useful to
         other processing.
         """
-        if not self.pendingparentchange():
-            msg = b'calling `update_file` outside of a parentchange context'
-            raise error.ProgrammingError(msg)
         if merged and (clean_p1 or clean_p2):
             msg = b'`merged` argument incompatible with `clean_p1`/`clean_p2`'
             raise error.ProgrammingError(msg)