Small improvements to nio native code (unix)

[Alan Bateman]

Martin Buchholz wrote:
>
>
> :
>
>  
>
>     In passing, I see in Java_sun_nio_ch_IOUtil_makePipe doesn't close
>     the pipe in the highly unlikely event that the configureBlocking
>     fails. It might be good to fix that while you are there (if you
>     don't mind of course).
>
>
> Done.
>
> Webrev regenerated.
>
Thanks for doing that. It's probably to close the pipe after 
JNU_ThrowIOExceptionWithLastError (in case one of the close calls fails, 
overriding errno).

-Alan.

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