don't attempt netmask setting if IP is 0, on Linux. from Thamer Al-Harbash <tmh@whitefang.com>
don't attempt netmask setting if IP is 0, on Linux. from Thamer Al-Harbash <tmh@whitefang.com>


git-svn-id: 935794000d934034fad4bb4152be248a7507e5ff@401 0c474577-fa26-0410-a966-bdb198e94e9e

hellais/libdnet,hellais/libdnet,hellais/libdnet,hellais/libdnet