Use lock() provided by the transaction manager.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2239 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/master/handlers/storage.py

@@ -68,9 +68,7 @@ class StorageServiceHandler(BaseServiceHandler):
             raise ProtocolError('TID too big')
 
         # transaction locked on this storage node
-        t = tm[tid]
-        if not t.lock(uuid):
-            return
+        if tm.lock(tid, uuid):
             self._afterLock(tid)
 
     def _afterLock(self, tid):