Tweak EOF handling of streams
Typically when you get EOF on a stream, poll will return POLLIN|POLLHUP at the same time. Thus when we deal with stream reads, if we see EOF during the read, we can then clear the VIR_STREAM_EVENT_HANGUP & VIR_STREAM_EVENT_ERROR event bits. Signed-off-by: NDaniel P. Berrange <berrange@redhat.com> (cherry picked from commit e7b03829)
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