ws2_32: Fail when select is called with an invalid fd. (try 4)

[Vincent Povirk]

(Of course, I can either include a message or remember the patch, but not both.)

This time I'm calling release_poll_fds. I think this will prevent leaking of fd's, but it does test the exceptfds for errors (harmless but unnecessary afaict). I don't know if duplicating the code is better, so I default to the easy choice.

Eventually, I have to get this right by trial and error.
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