[Linux-stable-mirror] Security fixes for 4.9

Please cherry-pick the following commits for 4.9-stable:

fdf7cb4185b6 mac80211: accept key reinstall without changing anything 2bdd713b92a9 mac80211: use constant time comparison with keys cfbb0d90a7ab mac80211: don't compare TKIP TX MIC key in reinstall prevention fc27fe7e8dee ALSA: seq: Cancel pending autoload work at unbinding device 7c80f9e4a588 usb: usbtest: fix NULL pointer dereference ea04efee7635 Input: ims-psu - check if CDC union descriptor is sane

For the ALSA seq fix, you'll need to change the patched filename from sound/core/seq_device.c to sound/core/seq/seq_device.c. The rest should apply cleanly.

Ben.