Actually make bc timeout

Signed-off-by: Rahix <rahix@rahix.de>

bc.lua

@@ -171,7 +171,7 @@ function BaseControl:finalize(waits, timeout)
       if timeout ~= nil then
         timeout_remaining = timeout - (computer.uptime() - tstart)
         if timeout_remaining <= 0 then
-          break
+          error("timeout")
         end
       end
       -- Wait until the next register arrives

tests/timeout.lua

@@ -50,5 +50,7 @@ end
 function test_timeout_finalize()
   local bc1 = BaseControl:new()
   local addr1 = network.get_scene()
+  assert_error_match("timeout", function()
     bc1:finalize({"to_final1"}, 0.1)
+  end)
 end