ospf: Fix type-4 network mask to 0 per RFC

The OSPF RFC (2328) states that the network mask field of a type 4
LSA "is not meaningful and must be zero".  OSPFD has been setting
the mask as /32.  This patch changes OSPFD to set the mask to 0 per
the RFC

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
1 file changed