Fix setting revents in bluetooth_playback_poll_revents

This fix will unfortunately break any applications that make use of
snd_pcm_wait (audacious is one of them). However, without this fix most
applications using snd_pcm_poll_descriptors_revents will cause access to
invalid memory as they only pass a single integer (while
snd_pcm_wait_nocheck passes a full array). The following thread on the
alsa mailing list has more information:
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-February/014392.html

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