fix bug in localrepo.changes.

caused by 1e32e2fe8a677c391049d40b8794478976a0a914.

mercurial/localrepo.py

@@ -617,6 +617,7 b' class localrepository(object):'
                     del mf[fn]
             return mf
 
+        modified, added, removed, deleted, unknown, ignored = [],[],[],[],[],[]
         compareworking = False
         if not node1 or node1 == self.dirstate.parents()[0]:
             compareworking = True