[Differential] D8740: remove network mask calculation for Classful network

[glebius (Gleb Smirnoff)]

glebius accepted this revision.
glebius added a comment.
This revision has a positive review.


  This looks correct to me. But I haven't reviewed the consequences of writing directly to the "netmask", which is also shared with rarp.c and udp.c
  
  Thanks!

REVISION DETAIL
  https://reviews.freebsd.org/D8740

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To: kczekirda, bapt, imp, ian, oshogbo, tsoome, freebsd-net-list, glebius, #network
Cc: glebius