Make WConfD's updateLocksWaiting safe

...so that the implicit retry on connection failure
is handled gracefully.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>

src/Ganeti/WConfd/Core.hs

@@ -276,7 +276,7 @@ updateLocksWaiting cid prio req =
   liftM S.toList
   . (>>= toErrorStr)
   . modifyLockWaiting
-  $ LW.updateLocksWaiting prio cid (fromGanetiLockRequest req)
+  $ LW.safeUpdateLocksWaiting prio cid (fromGanetiLockRequest req)
 
 -- | Tell whether a given owner has pending requests.
 hasPendingRequest :: ClientId -> WConfdMonad Bool