This fixes the crash from:
bash -c 'while true; do ifconfig wg0 create; ifconfig wg0 destroy; done&
while true; do wg show wg0 > /dev/null 2>&1; done& wait'
Since we're setting ifp to NULL here, we also have to account for
multicast v6 packets being transmitted during destroy, which can be
triggered by:
ifconfig wg0 create
ifconfig wg0 inet6 fe80::1234/120
ifconfig wg0 up
route add -inet6 ff02::1:0/120 -iface wg0
ifconfig wg0 destroy
These are unfixed upstream bug that we're working around.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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