del transaction before lock before wlock

This way rollbacks happen while the repo is still locked.

Deleting lock before wlock is not strictly necessary, but is
more consistent with the locking order.

hgext/mq.py

@@ -455,7 +455,7 b' class queue:'
                     repo.dirstate.invalidate()
                 raise
         finally:
-            del lock, wlock, tr
+            del tr, lock, wlock
 
     def _apply(self, repo, series, list=False, update_status=True,
                strict=False, patchdir=None, merge=None, all_files={}):

mercurial/commands.py

@@ -1623,7 +1623,7 b' def import_(ui, repo, patch1, *patches, '
             finally:
                 os.unlink(tmpname)
     finally:
-        del wlock, lock
+        del lock, wlock
 
 def incoming(ui, repo, source="default", **opts):
     """show new changesets found in source

mercurial/localrepo.py

@@ -544,7 +544,7 b' class localrepository(repo.repository):'
             else:
                 self.ui.warn(_("no rollback information available\n"))
         finally:
-            del wlock, lock
+            del lock, wlock
 
     def invalidate(self):
         for a in "changelog manifest".split():
@@ -820,7 +820,7 b' class localrepository(repo.repository):'
             self.hook("commit", node=hex(n), parent1=xp1, parent2=xp2)
             return n
         finally:
-            del lock, wlock, tr
+            del tr, lock, wlock
 
     def walk(self, node=None, files=[], match=util.always, badmatch=None):
         '''