Fix a bug in route(8)

[Nuno Antunes]

Hi,

The attached patch allows "route add 128/8 <gateway>" to work
correctly. While here, rectify the way netmasks are deduced from the
address class.

Please verify.

Noticed-by: Tom Judge <tom at tomjudge.com>
Reported-on: freebsd-net mailing list

Thanks,
Nuno
Attachment:
sbin.route.patch
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