[Openais] corosync - handle POLLNVAL in coroipcc

[Jan Friesse]

Releated to https://bugzilla.redhat.com/show_bug.cgi?id=582313

Old code in coroipcc doesn't handle POLLNVAL. It can happen, that some
applications (for example fenced) will stuck forever.

Also poll result is now handled much more correctly.

Regards,
  Honza
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