phase: remove useless test, olddata is never None

mercurial/commands.py

@@ -4443,8 +4443,6 b' def phase(ui, repo, *revs, **opts):'
                 phases.retractboundary(repo, targetphase, nodes)
         finally:
             lock.release()
-        if olddata is not None:
-            changes = 0
             newdata = repo._phasecache.getphaserevs(repo)
             changes = sum(o != newdata[i] for i, o in enumerate(olddata))
             rejected = [n for n in nodes