Import upline security patch: Extend protection of GTK/IGTK
reinstallation of WNM-Sleep Mode cases. This git commit
87e2db16bafcbc60b8d0016175814a73c1e8ed45.
Obtained from: https://w1.fi/security/2017-1/\
rebased-v2.6-0003-Extend-protection-of-GTK-IGTK-\ reinstallation-of-WNM-.patch