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Fix/ifa netmask null (#1120)

The first commit handles the possibility that `ifa->ifa_netmask` is
null, by defaulting netmask to zero.

Then I got worried about whether that was a good default - and
discovered that no caller ever asks for the netmask anyway. So the
second commit just deletes the code that deals with it.

Signed-off-by: David Hotham (@dimbleby)

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