[hal patch] Fix 100% CPU spinning and input device breaking in input addon

[Martin Pitt]

Hi all,

Jon Oberheide tracked down a file descriptor mishandling bug in
addon-input (https://launchpad.net/bugs/211343). This caused the addon
to use 100% CPU on a lot of people's boxes, since it polled invalid
file descriptors from disappeared devices. The patch makes sure that
in that case the callback is called and that returns false (and thus
removes the FD from the watched set).

Thanks,

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)
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