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getaddrinfo() doesn't actually set errno, it has its own error variable, so
returning -errno is not useful (it may be zero even if getaddrinfo failed).
So, simply return -1 if getaddrinfo fails, to indicate a name resolution
or badly formed address.
git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@1025 fd59a12c-fef9-0310-b244-a6a79926bd2f