Fix another sync problem

L2_GameServer/java/net/sf/l2j/gameserver/model/L2Summon.java

@@ -461,7 +461,7 @@ public abstract class L2Summon extends L2PlayableInstance
         
     }
 
-    public synchronized void unSummon(L2PcInstance owner)
+    public void unSummon(L2PcInstance owner)
     {
 		if (isVisible() && !isDead())
 	    {