dirstate-item: use `maybe_clean` instead of `state` in `strip`

Differential Revision: https://phab.mercurial-scm.org/D11533

mercurial/strip.py

@@ -255,7 +255,9 b' def debugstrip(ui, repo, *revs, **opts):'
 
             # reset files that only changed in the dirstate too
             dirstate = repo.dirstate
-            dirchanges = [f for f in dirstate if dirstate[f] != b'n']
+            dirchanges = [
+                f for f in dirstate if not dirstate.get_entry(f).maybe_clean
+            ]
             changedfiles.extend(dirchanges)
 
             repo.dirstate.rebuild(urev, uctx.manifest(), changedfiles)