Don't access a Message's memory after calling it's destructor in Mess…

…ageQueue. (Even though the way the code works currently this was not really a bug, but it can easily become one.)

core/object/message_queue.cpp

@@ -438,12 +438,12 @@ MessageQueue::~MessageQueue() {
 				}
 			}
 
-			message->~Message();
-
 			read_pos += sizeof(Message);
 			if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
 				read_pos += sizeof(Variant) * message->args;
 			}
+
+			message->~Message();
 		}
 
 	} // for which