[PATCH] serial-port: turn open_count assertion in mm_serial_port_close into simple return

[Ben Chan]

> One option would be to have all the MMQueueData items be completed in an
> idle, so that when they are really completed the port was already marked
> as forced_close. I know it's probably too much just to handle this case,
> but I also think it's important to warn about the incorrect open/close
> counts; and the idle completion is actually a good idea as we avoid
> chaining up normal close()s within the forced_close() call.
>
> I'd suggest to wait until we release 1.2, because after that I'd like to
> merge the 'aleksander/ports-refactor' branch, and in that branch the
> change needed to have the MMQueueData item (named CommandContext in the
> branch) completed in idle is just a rename of
> g_simple_async_result_complete() to
> g_simple_async_result_complete_in_idle().
>

complete_in_idle would work but that requires all contexts to be aware
of the semantics. Is the CommandContext going to replace all contexts
(i.e. one rename is enough)?