push: reunite comment with the line of code it describes

mercurial/localrepo.py

@@ -1885,8 +1885,8 b' class localrepository(object):'
 
         if not remote.canpush():
             raise util.Abort(_("destination does not support push"))
+        unfi = self.unfiltered()
         # get local lock as we might write phase data
-        unfi = self.unfiltered()
         locallock = self.lock()
         try:
             self.checkpush(force, revs)