[Ns-commits] craigdo/ns-3-param

[code@nsnam-code.ece.gatech.edu]

---- check for null callback in wifi link change
user: Craig Dowell <craigdo at ee.washington.edu>
files: src/devices/wifi/wifi-net-device.cc src/topology/ipv4-address-manager.cc
url: http://code.nsnam.org/craigdo/ns-3-param/rev/07d2a4a4753d