Fix infinite loop in daemon if client quits with multiple streams open

The daemon loops over the linked list of streams when a client
quits, closing any that the client hadn't already closed. Except
it didn't ever move to the next element in the list!

* daemon/stream.c: Fix loop over linked list of streams

daemon/stream.c

@@ -343,6 +343,7 @@ remoteRemoveClientStream(struct qemud_client *client,
                 filter->next = filter->next->next;
                 break;
             }
+            filter = filter->next;
         }
     }